Directional Character Research Articles

Substitutional Cu doping at the cation sites in Ba2YNbO6 toward improved visible-light photoactivity—A first-principles HSE06 study

Artificial photosynthesis holds immense promise for sustainable clean energy harvesting, with recent strides in material engineering with the earth abundant elements enabling efficient utilization of the visible solar spectrum for photoelectrochemical catalytic water splitting. Here, we have investigated the impact of substitutional Cu doping at all three cation sites in Ba2YNbO6 (BYN) using density functional theory calculations at the Heyd-Scuseria-Ernzerhof-06 level. One of the key findings is that the defect formation energy follows the hierarchy Nb > Ba > Y. The presence of an oxygen vacancy (OV) enhances the co-solubility of Cu substitution of Nb, particularly when placed outside the CuO6 unit, while it has a contrary effect for Y substitution. Cu replacement reduces the bandgap as Nb > Y ≫ Ba vis-à-vis pure BYN, while extending it into the visible part of the solar spectrum for Nb and Y replacement cases, albeit with OV causing a slight blue shift to them, without reducing the oxidation state of Cu due to strong charge-delocalization. Cu doping at Y and Nb sites retains the direct band transition character of BYN, a feature removed by OV. While all the bare Cu doped systems exhibit formation of a weak electron polaron, the placement of OV tends to annihilate this except for the system comprising first nearest neighbor placement of an OV relative to the Cu substitution at an Nb site. Notably, Cu doping at the Nb site significantly enhances optical activity, particularly ∼2.0–2.5 eV, resulting in promising candidates for photoelectrochemical catalysts.

Effect of NH3 preadsorption on SO2 adsorption on Hf2CO2 MXene

Preadsorbing suitable gas molecule on the substrate can effectively improve the adsorption strength of the system. The adsorption properties of preadsorping NH3 on SO2-adsorbed Hf2CO2 monolayer are explored by first-principles calculation. All possible adsorption sites are considered. SO2 molecule cannot be adsorbed by Hf2CO2 monolayer, while preadsorbing NH3 can increase the adsorption strength of SO2-adsorbed Hf2CO2 monolayer. The adsorption system has the direct semiconductor character and is the reusable SO2 gas sensor because of short recovery time and the appropriate adsorption strength. Preadsorbing NH3 can decrease the carrier mobility in conduction band, but has little impact on the carrier mobility in valence band. The charge transfer of the co-adsorption system is also investigated.

Association between Symptoms of Depression and Generalised Anxiety Disorder Evaluated through PHQ-9 and GAD-7 and Anti-Obesity Treatment in Polish Adult Women.

Obesity impacts mental health greatly. Psychological factors may influence the effectiveness of its treatment. This study aimed to compare symptoms of generalised anxiety disorder and depression among adult women across different weight categories. The study sample comprised 1105 adult women. The computer-assisted web interview (CAWI) utilising the seven-item Generalised Anxiety Disorders Scale (GAD-7) and the nine-item Patient Health Questionnaire (PHQ-9) was used. Both GAD-7 and PHQ-9 scores correlated positively with BMI (r = 0.121, p < 0.001 and r = 0.173, p < 0.001, respectively) and negatively with age (r = -0.106, p < 0.001 and r = -0.103, p < 0.001, respectively). Patients undergoing treatment with semaglutide scored lower for both anxiety symptoms (8.71 ± 6.16, p = 0.013) and depression symptoms (9.76 ± 6.37, p = 0.013). Women who underwent bariatric surgery screened less frequently for anxiety (8.03 ± 6.27, p = 0.002) but not for depression. An interdisciplinary approach involving mental health professionals within the therapeutic team can comprehensively address factors contributing to obesity development and treatment outcomes. Further investigation of semaglutide's use is needed due to the promising evidence suggesting a positive effect on decreasing the severity of depression and anxiety symptoms to assess the direct or indirect character of this influence.

Structural and electronic properties of GaN: Ab initio study within LDA and LDA+U methods

Structural and electronic properties of the GaN were simulated based on Density Functional Theory implementing Local Density Approximation methods. Hubbard U correction gives us an opportunity to find the correct energy gap for GaN in agreement with known experimental results. Choosing more accurate investigation methods leads to calculating accurate electronic band structure and in the future predicting some physical properties of related material. The bottom of the conduction band and the top of the valence band are formed mainly by p-orbitals of host Ga and N atoms. The present study shows the direct band gap character of GaN with a wurtzite structure

Electric‐Responded 2D Black Phosphorus Nanosheets Induce Uniform Zn2+ Deposition for Efficient Aqueous Zinc‐Metal Batteries

AbstractAqueous zinc‐metal batteries (AZMBs) have demonstrated inspiring potential for large‐scale energy storage applications. However, their further utilization is impeded by issues such as severe side reactions and the uncontrolled penetrating dendrites growth. In this study, an innovative approach to modify the aqueous electrolyte with 2D black phosphorus nanosheets (denoted as 2D BP nanosheets) is proposed. The 2D BP nanosheets under the electric field acted as a unique electron directional migration character, can dynamically homogenize the electric field, facilitate homogeneous Zn2+ conduction. The nanosheets covering on the protuberances can also induce stable and homogeneous Zn2+ deposition, thereby effectively inhibit the formation of penetrating dendrites. More importantly, this special protective interlayer can further prevent the direct contact between reactive Zn‐metal and activated water molecules, thereby inhibiting the occurrence of undesirable side‐reactions. The incorporation of BP nanosheets induced significant improvement in electrochemical stability and reversibility for AZMBs. As a result, Zn//Zn symmetric batteries based on 2D BP nanosheets added electrolyte exhibited steady cycling for over 2800 h at 1 mA cm−2 1 mAh cm−2. Zn//NVO full‐cell preserved 78.85% capacity even after ultra‐long 1000 cycles. The successful application of 2D BP nanosheets introduce a novel method to accelerate the practical application of AZMBS.

Electronic and magnetic properties of Me-Graphene nanoribbons: A DFT investigation

In the search for semiconducting materials at the nanoscale, theoretical methods have been used to propose a series of nanocarbon sheets featuring a mixture of sp2 and sp3 hybridized carbon atoms, with Me-Graphene as one example. In addition to interesting physical properties shown by these 2D forms, nanoribbon variations of these structures can feature new properties. In this work, we show that the electronic properties of Me-Graphene nanoribbons can be modulated through structural details such as chirality, width, and edge details. Not only the metallic or semiconducting behavior can be switched by choosing selected geometries, but the direct or indirect character of the gap of the semiconducting cases can be triggered by selecting specific chiralities. In particular combinations of chirality and edge structure, we further point out that multiple spin-polarized states emerge, turning these systems into potential materials for spintronics.

Reconfiguring the Optical Selection Rule in Ultramicrotome‐Crafted Vertically Aligned InSe Ribbons

AbstractDue to the high carrier mobility and direct bandgap character, indium selenide (InSe) exhibits great advantages for advanced optoelectronic applications. However, the unique optical section rule in InSe weakens the light‐matter interaction when the electric field of illuminated light is perpendicular to the c‐axis of planar InSe flake. To overcome this constraint, ultramicrotome technique is introduced to achieve vertically aligned InSe ribbons, aiming to reconfigure the optical paths for improved optical absorption and device performance. The well‐designed InSe ribbons are acquired with uniform morphology, showing an integrated structure free of cracks or fragments. First, the structural symmetry, crystal orientation, and optical anisotropy of InSe ribbon are carefully revealed by polarization‐dependent Raman spectrum, second harmonic generation (SHG), and photoluminescence measurements. Then, the back focal plane (BFP) imaging of photoluminescence distinguishes the in‐plane and out‐of‐plane dipole emission of InSe ribbons and planar InSe flakes, respectively. Notably, the ribbon exhibits new PL peaks with energy lower than the exciton peak of InSe at low temperature, which is attributed to Se vacancies. The work by introducing vertically aligned InSe nanoribbons provides a new strategy to manipulate the light‐matter interactions and defect engineering for novel optoelectronics, which can be also extended to other 2D semiconductors.

Cytokine and immunoglobulin profiles of Arbor Acres broiler chickens at different stages of physiological development.

Modern scientific research focuses on a detailed study of the immune system, the mechanisms of immunosuppression, and the search for an effective means to restore disturbed immune homeostasis in farm animals. The present study examined the cytokine and immunoglobulin (Ig) profiles of healthy broiler chickens during physiological development. Arbor Acres broilers (n = 28) were used in the study to achieve this objective. The immune status of broiler chickens was assessed on 7, 14, 28, and 42 days of age, including serum levels of cytokines, Igs, and lysozyme by enzyme immunoassay. We observed a decrease in the efficiency of immune system functioning of birds with increasing age. The most pronounced immunological deficiency in the body of broiler chickens is noted at the age of 7-14 days, which is associated with immaturity of the immune system and is characterized by the fact that non-specific humoral and specific cellular defense factors are at a rather low level. The levels of lysozyme, interleukin (IL)-2, IL-10, and IgA in blood serum at this age were minimal; starting from 28 days of age, there is a specific humoral immune deficiency, which is compensated by strengthening of cellular defense factors. The serum level of IgY intensively decreases against the background of an increase of lysozyme, IL-2, IL-4, and IL-10. During postnatal ontogenesis, the immune system of broiler chickens undergoes dynamic changes that have an age direction and phase character. Changes in the immune system may affect immunocompetence, disease susceptibility, and, consequently, productivity.

How backstory and direct address reformulate the Shakespearean character on television: The case of the missing psychological motivation for House of Cards’ Frank Underwood

This article delves into narrative elements of direct address and backstory in television, focusing on House of Cards (2012–19), Shakespeare’s Richard III and Game of Thrones (2011–19). Comparing dramaturgical approaches in stage plays and TV series, the study highlights House of Cards’ unique incorporation of a pragmatic use of the direct address to create ‘world-view’ for character exploration. The analysis extends to Game of Thrones, emphasizing Tyrion Lannister’s self-descriptive addresses revealing a psychological struggle rooted in rejection and backstory. The article proposes a methodological framework linking first lines or direct addresses to character backstories, emphasizing the role of self-descriptive asides in character creation. It introduces the concept of a ‘psychological motivational arc’ within character arcs, exploring how direct addresses contribute to nonlinear character development. Concluding with an in-depth examination of House of Cards’ Frank Underwood, it scrutinizes Willimon’s ‘show, don’t tell’ approach, questioning its potential limitations on character depth and challenging traditional screenwriting advice. The analysis unravels the interplay between direct address, backstory, and character development in television series, offering insights into evolving narrative techniques and their implications for contemporary screenwriting.

Straintronics with single-layer MoS2 : A quantum Monte Carlo study

Using state-of-the-art quantum Monte Carlo (QMC) methods, we study straintronic properties of a single MoS2 monolayer. 2D MoS2 is a quintessential straintronic material for which many experiments have been performed. First, we determine the equilibrium atomic structure which is not known experimentally and is strictly needed to correctly determine the straintronic properties. That enables us to precisely analyze the quasiparticle band gaps for any applied biaxial strain, which we describe by a bivariate paraboloid function of lattice constant and internal structural parameter. Using the fixed-node QMC calculations fitted by analytical formulas, we localize the following excited state crossings between the direct, K→K, and indirect Γ→X and K→K/2 excitations. Based on this highly accurate many-body treatment, we predict a gauge factor of 136 meV/% for the K→K transition and a fairly narrow window of ≈2.8% from compressive to mildly tensile strains, accounting for only ≈0.3 eV band gap change maintaining the direct character of the gap. Consequently, we suggest that, compared to other 2D materials, such as phosphorene, there is only a limited straintronic tuneability in this material often studied for its straintronic properties. QMC results are compared to results of standard DFT modeling, which reveal insights into the corresponding inaccuracies and therefore open a window for educated use of rapid DFT approaches. Published by the American Physical Society 2024

The direct Z-scheme character and roles of S vacancy in BiOCl/Bi2S3-(001) heterostructures for superior photocatalytic activity: a hybrid density functional investigation.

Given some current speculations and controversies regarding the type of BiOCl/Bi2S3-(001) heterostructure in experiments, it is of great importance to clarify these controversies and further explain the relevant experimental results. In this work, based on first-principles hybrid density functional calculations, it is verified that the BiOCl/Bi2S3-(001) heterostructure is a direct Z-scheme photocatalyst with high photo-generated carrier separation efficiency and strong redox ability that can react with O2 and OH- to produce photocatalytic active species of superoxide ions (˙O2-) and hydroxyl radicals (˙OH), respectively. This is consistent with the experimental findings and explains the excellent photocatalytic performance of the BiOCl/Bi2S3-(001) heterostructure in experiments. Besides, excitingly, it is found that the optical absorption, built-in electric field intensity, interlayer recombination probability, hydrogen evolution reaction ability, and the difference in electron-hole mobility are further enhanced via S vacancy introduction in BiOCl/Bi2S3-(001). Therefore, the significant roles of S vacancy in further improving the photocatalytic properties of the BiOCl/Bi2S3-(001) heterostructure are profoundly revealed. This work can provide valuable theoretical insights for designing the superior direct Z-scheme BiOCl/VS-Bi2S3-(001) heterostructure with promising photocatalytic properties.

Оpposition of historical narratives in the drama: Ukrainian optics (based on the play by Ihor Yuzyuk “There under the black forest... Banderado”)

In the article, Ihor Yuzyuk’s play “There under the black forest... Banderado” is analyzed from the standpoint of various historical and ideological narratives regarding the movement of the Ukrainian national liberation resistance. The playwright uses the conceptual metaphor “banderado” (Spanish “flag bearers”) in the title of the work, and reproduces it in the content characteristics of its individual parts (a total of 8 banderado inserts with different plots about the individual heroism of Ukrainians from the Cossacks to the first post-Soviet years). Therefore, Yuzyuk’s drama can be considered as a meaningful narrative polemic with Oles Gonchar’s novel “The Standard Bearers”, because Gonchar interprets the role of Ukrainian soldiers as an organic segment of the Soviet army, which liberated European countries from Hitler’s fascism, but brought Stalin’s socialism there with bayonets. The phonetic consonance of the concept “banderado” with the surname of one of the leaders of the Ukrainian national liberation movement unfolds the discourse of Stepan Bandera himself, who does not become a direct character of the play, but is constantly mentioned in its dialogues. Ihor Yuzyuk shows how both totalitarian regimes — both Hitler’s and Stalin’s — tried to use and compromise Bandera and his supporters, how they used the “colonial army” of Ukrainians in their interests and did not pay attention to the colossal human losses, because “they are not counted, they are counted”. Considering the Ukrainian territory as a multi-front zone, which during the Second World War was on the brink of two totalitarian regimes, the playwright seeks to create new narratives both of the war itself and of the Ukrainian national liberation resistance. Every new play about Bandera will be relevant now, because since the beginning of the full-scale Russian aggression, the very name of Stepan Bandera has become for Ukrainians a symbol of unity, joint resistance and a sign of liberation from the hypnosis of a blurred psychedelic identity.

Pragmatic functions of evidentiality in the response judgments at a political interview

The article is devoted to the establishment of expression forms and the description of the pragmatic functions of evidentiality in the interviewed politician’s response discourse in the context of the official discussion. The research is aimed at identifying and analyzing the pragmatic specifics of evidentiality as the politician’s strategic tool in the interview, assuming a special evidence base in order to manipulate and convince the target audience. Based on a solid sample of fragments of an English-language political interview in which respondents raise current socio-economic problems, an original classification of the expression means and pragmatic functions of evidentiality is proposed in accordance with such parameters as the source of relevant information and the way of the everyday reality cognition. Relying on critical discourse analysis, the method of extracting and annotating evidential markers of the response judgment effectiveness, their subsequent quantitative and qualitative analysis, the description of various evidentiality types that underlie the interviewed politician’s ideological attitudes and the pragmatic functions of these types are given. It is established that in the format of reacting judgments, evidentiality functions as the consequence of the interviewed politician’s need in activating effective information sources that can be based on personal knowledge, well-known information about socio-economic reality and other sources. At the same time, the politician’s evidence base may be of direct, indirect and presumptive character. It is revealed that the interviewed politician to cover the ideological attitudes of his / her activities also uses evidentiality as it legitimizes one’s own judgments and delegitimizes alternative (opposite) opinions,. The interviewed politician’s evidence source base is characterized, which reflect ideological bias due to the coding of hypothetical assumptions about the authority of representatives of the political sphere, facts of reality, well-known information. The contexts are analyzed when the politician assumes responsibility for the publication of relevant information, resorting to the sources of information actually obtained and thereby strengthening the argumentation of the propositions put forward. The typology of the sources of the interviewed politician’s evidence base is proposed.

Surface functionalization of graphene-like boron arsenide monolayer: a first-principles study

In this work, the effects of hydrogen (H) and oxygen (O) adsorption on the electronic and magnetic properties of graphene-like boron arsenide (BAs) monolayer are investigated using first-principles calculations. Pristine monolayer is a non-magnetic two-dimensional (2D) material, exhibiting direct gap semiconductor character with band gap of 0.75 (1.18) eV as calculated by generalized gradient approximation with Perdew–Burke–Ernzerhof (HSE06) functional. Four high-symmetry adsorption sites are considered, including on-top of B atom (), on-top of As atom (), on-top of hollow site (), and on-top of bridge site (). Using the criterion of adsorption energy, it is found that and sites are favorable adsorption sites for H and O adatom, respectively. The analysis of electronic interactions indicate the charge transfer from host BAs monolayer to both adatoms. H adsorption conducts to the emergence of magnetic semiconductor nature in BAs monolayer with a total magnetic moment of 1.00 . Herein, the magnetism is originated mainly from H adatom and its neighbor As atoms. In contrast, the non-magnetic nature of BAs monolayer is preserved upon absorbing O atoms. In this case, the energy gap exhibits a slight reduction of 4%. Further, the effects of adatom coverage are also analyzed. The presented results suggest an effective modification of ground state electronic properties, as well as induction of new feature-rich properties to make new multifunctional 2D materials from non-magnetic BAs monolayer.

Enhanced visible-light photocatalytic activity of BiOBr/BiOCl heterojunctions: A hybrid density functional investigation on the key roles of crystal facet and I-doping

In this work, (001) and (010) facets of BiOBr and BiOCl are selected to construct BiOBr(001)/BiOCl(001), BiOBr(010)/BiOCl(010), BiOBr(001)/BiOCl(010) and BiOBr(010)/BiOCl(001) heterostructure models for investigating the effect of crystal facet engineering on the photocatalytic activity of BiOBr/BiOCl through hybrid functional calculations. We found that the crystal facet is critical to the photocatalytic performance of BiOBr/BiOCl. The BiOBr(001)/BiOCl(001) and BiOBr(010)/BiOCl(010) with the same facet combinations in BiOBr/BiOCl present the unexpected type I band alignments and the poor photocatalytic activities. In contrast, the BiOBr(001)/BiOCl(010) and BiOBr(010)/BiOCl(001) with different facet combinations present the type II and direct Z-scheme characters, respectively, so that they can effectively separate the photo-excited electron-hole pairs in space. Especially, the direct Z-scheme BiOBr(010)/BiOCl(001) heterostructure can exhibit the stronger redox ability and better visible light absorption, further presenting excellent photocatalytic performance, in contrast to the type II BiOBr(001)/BiOCl(010). The investigations also show that Iodine (I) element doping can make type I BiOBr(001)/BiOCl(001) change to a direct Z-scheme band alignment and dramatically enhance its photocatalytic activity. This helps to interpret the related experimental results. Notably, I doping can significantly improve the visible light absorption of BiOBr(010)/BiOCl(001) heterostructure, enhance the solar-to-hydrogen (STH) efficiency, and still maintain its superior direct Z-scheme character. Therefore, these theoretical studies can provide valuable guidance in developing novel BiOBr/BiOCl heterostructures with high photocatalytic activities.

First-principles study of the rare earth anti-TH3P4 type zintles for opto-electronic and thermoelectric applications

Structural, optoelectronic and thermoelectric properties of rare earth Zintls Ca3RESb3 (RE = La, Ce and Pr) isostructural with anti-Th4P3 are studied in cubic I4− 3d space groups. Structural parameters are reliable with experimental results and lattice parameters are decreasing due to lanthanide contraction from La to Pr. Cohesive energy and enthalpy indicate that Ca3PrSb3 is more stable than the others. Electronic properties reveal the direct bandgap semiconductors character of these compounds at the central symmetry, these compounds are and are increases going from La to Pr. Based on their optical characteristics, all material are active in the infrared region. Because of their optical dynamic quality, they could be used in optoelectronic devices. Based on their thermoelectric characteristics, they are effective thermoelectric materials as thermoelectric generator.

Explore the feasibility of Janus 2H-VSeTe monolayer as anode material for Li ion battery

Two-dimensional (2D) materials as potential energy storage systems have received extensive attention due to their high energy density and rate performance. Here, the electronic properties and feasibility of Janus 2H-VSeTe monolayer as LIBs anode material are systematically investigated using the first-principles calculations. No imaginary frequency in the phonon spectrum and the absence of obvious deformation simulated by AIMD simulations at 300 K prove the dynamic and thermal stability of Janus 2H-VSeTe monolayer, respectively. The pure Janus 2H-VSeTe monolayer exhibits a small direct band gap semiconductor character. The Li atom adsorption can result in the increase of electronic states near Ef and a transform of metallic behavior, ensuring good conductivity for the Janus 2H-VSeTe monolayer. On the other hand, the adsorbed Li atoms are fully ionized to ensure the charge and discharge process by the Bader analysis. Through the climbing-image nudged elastic band method, two possible migration paths are considered on the Se and Te surfaces, respectively. The lowest potential barriers are 0.159 eV and 0.188 eV, respectively, which proves that there is a high ion migration rate during charge and discharge process. The OCV and multi-layer Li atoms adsorption suggest that the corresponding specific capacity is 416 mA h g−1 for the Janus 2H-VSeTe monolayer, which reveals that Janus 2H-VSeTe monolayer is one of the feasible candidates for LIBs anode materials.

Electroluminescence from Megasonically Solution-Processed MoS2 Nanosheet Films.

Due to their superior optoelectronic properties, monolayer two-dimensional (2D) transition metal dichalcogenides (TMDs) have attracted significant attention for electroluminescent devices. However, challenges in isolating optoelectronically active TMD monolayers using scalable liquid phase exfoliation have precluded electroluminescence in large-area, solution-processed TMD films. Here, we overcome these limitations and demonstrate electroluminescence from molybdenum disulfide (MoS2) nanosheet films by employing a monolayer-rich MoS2 ink produced by electrochemical intercalation and megasonic exfoliation. Characteristic monolayer MoS2 photoluminescence and electroluminescence spectral peaks at 1.88-1.90 eV are observed in megasonicated MoS2 films, with the emission intensity increasing with film thickness over the range 10-70 nm. Furthermore, employing a vertical light-emitting capacitor architecture enables uniform electroluminescence in large-area devices. These results indicate that megasonically exfoliated MoS2 monolayers retain their direct bandgap character in electrically percolating thin films even following multistep solution processing. Overall, this work establishes megasonicated MoS2 inks as an additive manufacturing platform for flexible, patterned, and miniaturized light sources that can likely be expanded to other TMD semiconductors.

PECULIARITIES OF FORENSIC HANDWRITING EXAMINATION OF SIGNATURES MADE BY PERSONS OF ALL AGES UNDER THE INFLUENCE OF CONFOUNDING FACTORS

The article is devoted to the features of forensic handwriting examination of signatures made by persons of different ages under the influence of confounding factors. The classification of confounding factors and their influence on signs of handwriting and signatures of a person is considered. The peculiarities of signatures and samples of different age groups were studied, namely: transcription of the signature, degree of coordination, complexity and coherence of movements, the pace of writing, size, inclination, arrangement and acceleration of elements, degree and character of pressure and direction of the baseline of the signature. It is shown that three classes of tasks are distinguished in the forensic handwriting examination: identification (establishing the identity of the executor of the object of handwriting), diagnostic (resolving questions about the conditions of execution of the handwritten text, record or signature), classification (related to the assignment of the executor of the handwriting to certain groups, in particular by gender and age). A comparative analysis of the results of signature studies by different age groups was carried out. It is noted that the stability of signs of handwriting and signatures is relative. A person’s handwriting can undergo changes depending on various reasons, including those caused by the ageing of the body. In addition, the persistence of characteristic features is also influenced by diseases that are characteristic of the elderly and senile.

Experimental-computational approach to investigate elastic properties of struvite.

The research presented in the paper concerns the elastic properties of struvite. The article combines theoretical and experimental research. Experimental studies were carried out on struvite single crystals grown in sodium metasilicate gel by single diffusion. This unique method leads to obtaining crystals of sufficiently large size to conduct, for the first time, experimental measurement of elastic properties of monocrystalline struvite. Using the nanoindentation method, the Ez = 29.1 ± 0.7GPa value of the component of Young's modulus was determined for a struvite single crystal. In addition, the elastic constants C11, C22, and C33 were determined using micro-Brillouin spectroscopy. Theoretical calculations of the abovementioned properties have been carried out by employing density functional theory methods. Scaling of the theoretical elastic constants leads to obtaining good agreement with the experimental values. Values of the Ex and Ey components of the Young's modulus, not available from the experimental nanoindentation technique, have been determined theoretically as 23GPa and 27GPa, respectively. Differences in the values of elastic components and Young's modulus components are related to the layered crystal structure of struvite and directional character of the hydrogen-bonding pattern.