Maximum Polarization Research Articles

A Strategy of Enhancing Polarization to Achieve Excellent Energy Storage Performance in Simple Bi0.5K0.5TiO3‐Based Relaxors

AbstractDielectric energy storage capacitors are indispensable components in advanced electronic and electrical systems. Excellent performance requires the dielectric materials possessing low residual polarization (Pr), high breakdown strength (Eb), and large maximum polarization (Pm). The first two parameters can be typically achieved through chemical regulation, while the Pmax is closely related to the matrix. Theoretical calculations demonstrate that a strong coupling of A‐O bonds and a large lattice can enhance polarization, thus identifying the prototype Bi0.5K0.5TiO3 as a favorable matrix. Here, ultrahigh energy density of 16.5 J/cm3 and high efficiency of 88.2 % are achieved in 0.76Bi0.5K0.5TiO3‐0.24Ca0.5Sr0.5HfO3 binary system. This system exhibits the highest comprehensive performance among all reported Bi0.5K0.5TiO3‐based ceramics. The large perovskite framework facilitated by the large ionic radius of K+ enhances the local polarity of Bi−O and Ca−O, resulting in a large Pm of 57.4 μC/cm2 under an ultrahigh Eb of 82 kV/mm. The highly disordered local polar clusters at the nanoscale lead to negligible Pr and high η. This work not only provides a unique design concept to enhance the comprehensive energy storage performance from the perspective of local structure, but also offers insight into the origin of high performance.

Aerosol Deposited Polycrystalline PbZr0.53Ti0.47O3 Thick Films with a Large Transverse Piezoelectric Coefficient

The aerosol deposition (AD) method utilizes high kinetic-energy submicron powders to impact and form a film on a substrate. It is a highly efficient deposition method, capable of producing films or coatings with a strong interfacial bonding and a dense nano-grain structure without thermal assistance. In this work, PbZr0.53Ti0.47O3 (PZT53/47) films (~1.2 μm thick) were deposited on Pt/Ti/Si(100) substrates via the AD method. After a conventional annealing process (700 °C for 1 h), these PZT53/47 films displayed a dense, crack-free, nano-grained morphology, corresponding to an optimal electrical performance. A large maximum polarization (Pmax = 70 μC/cm2) and a small coercive field (Ec = 104 kV/cm) were achieved under the maximum applicable electric field of 1.6 MV/cm. The PZT53/47 films also exhibited a large small-field dielectric constant of ~984, a high tunability of 72%, and a low leakage current of ~3.1 × 10−5 A/cm2 @ 40 V. Moreover, the transverse piezoelectric coefficient (e31.f) of these AD-processed films was as high as −4.6 C/m2, comparable to those of sputter-deposited PZT53/47 films. These high-quality PZT53/47 thick films have broad applications in piezoelectric micro-electromechanical systems.

A Strategy of Enhancing Polarization to Achieve Excellent Energy Storage Performance in Simple Bi0.5K0.5TiO3-Based Relaxors.

Dielectric energy storage capacitors are indispensable components in advanced electronic and electrical systems. Excellent performance requires the dielectric materials possessing low residual polarization (Pr), high breakdown strength (Eb), and large maximum polarization (Pm). The first two parameters can be typically achieved through chemical regulation, while the Pmax is closely related to the matrix. Theoretical calculations demonstrate that a strong coupling of A-O bonds and a large lattice can enhance polarization, thus identifying the prototype Bi0.5K0.5TiO3 as a favorable matrix. Here, ultrahigh energy density of 16.5 J/cm3 and high efficiency of 88.2% are achieved in 0.76Bi0.5K0.5TiO3-0.24Ca0.5Sr0.5HfO3 binary system. This system exhibits the highest comprehensive performance among all reported Bi0.5K0.5TiO3-based ceramics. The large perovskite framework facilitated by the large ionic radius of K+ enhances the local polarity of Bi-O and Ca-O, resulting in a large Pm of 57.4 µC/cm2 under an ultrahigh Eb of 82 kV/mm. The highly disordered local polar clusters at the nanoscale lead to negligible Pr and high η. This work not only provides a unique design concept to enhance the comprehensive energy storage performance from the perspective of local structure, but also offers insight into the origin of high performance.

Enhanced energy storage in antiferroelectrics via antipolar frustration.

Dielectric-based energy storage capacitors characterized with fast charging and discharging speed and reliability1-4 play a vital role in cutting-edge electrical and electronic equipment. In pursuit of capacitor miniaturization and integration, dielectrics must offer high energy density and efficiency5. Antiferroelectrics with antiparallel dipole configurations have been of significant interest for high-performance energy storage due to their negligible remanent polarization and high maximum polarization in the field-induced ferroelectric state6-8. However, the low antiferroelectric-ferroelectric phase-transition field and accompanying large hysteresis loss deteriorate energy density and reliability. Here, guided by phase-field simulations, we propose a new strategy to frustrate antipolar ordering in antiferroelectrics by incorporating non-polar or polar components. Our experiments demonstrate that this approach effectively tunes the antiferroelectric-ferroelectric phase-transition fields and simultaneously reduces hysteresis loss. In PbZrO3-based films, we hence realized a record high energy density among all antiferroelectrics of 189 J cm-3 along with a high efficiency of 81% at an electric field of 5.51 MV cm-1, which rivals the most state-of-the-art energy storage dielectrics9-12. Atomic-scale characterization by scanning transmission electron microscopy directly revealed that the dispersed non-polar regions frustrate the long-range antipolar ordering, which contributes to the improved performance. This strategy presents new opportunities to manipulate polarization profiles and enhance energy storage performances in antiferroelectrics.

High-entropy assisted capacitive energy storage in relaxor ferroelectrics by chemical short-range order

Next-generation advanced high/pulsed power capacitors rely heavily on dielectric ceramics with high energy storage performance. Although high entropy relaxor ferroelectric exhibited enormous potential in functional materials, the chemical short-range order, which is a common phenomenon in high entropy alloys to modulate performances, have been paid less attention here. We design a chemical short-range order strategy to modulate polarization response under external electric field and achieve substantial enhancements of energy storage properties, i.e. an ultrahigh energy density of ~16.4 J/cm3 with markedly improved efficiency ~90% at an electric field of 85 kV/mm in Nb doped (Bi0.2Na0.2K0.2La0.2Sr0.2) TiO3 system. Atomic-scale scanning transmission electron microscopy observations show that Nb exhibits a chemical short-range order structure, with Nb enriched regions displaying ultrasmall polar nanoregions and more flexible polarization configurations, which is conducive to achieving high maximum polarization and low residual polarization. Moreover, refined grain size of ~0.25μm, suppressed oxygen vacancies and enhanced bandwidth contribute to a high breakdown field strength. These collective factors result in exceptionally high energy storage density and efficiency. This short-range order strategy is expected to enhance the functional performances in other high entropy relaxor ferroelectrics.

1.5D Chiral Perovskites Mediated by Hydrogen-Bonding Network with Remarkable Spin-Polarized Property.

In this study, we developed new chiral hybrid perovskites, (R/S-MBA)(GA)PbI4, by incorporating achiral guanidinium (GA+) and chiral R/S-methylbenzylammonium (R/S-MBA+) into the perovskite framework. The resulting materials possess a distinctive structural configuration, positioned between 1D and 2D perovskites, which we describe as 1.5D. This structure is featured by a hydrogen-bonding-network-induced arrangement of zigzag inorganic chains, further forming an organized layered architecture. The structural dimensionality affects both electronic and spin-related properties. Density functional theory (DFT) calculations reveal Rashba splitting induced by the inversion asymmetry of the crystal structure, while circularly polarized transient absorption spectroscopy confirms spin lifetime on the nanosecond timescale. Magnetic conductive-probe atomic force microscopy (mCP-AFM) measurements demonstrate exceptional chiral-induced spin selectivity (CISS) with maximum spin polarization degrees of (92 ± 1)% and (-94 ± 2)% for (R-MBA)(GA)PbI4 and (S-MBA)(GA)PbI4, respectively. These findings underscore the potential of (R/S-MBA)(GA)PbI4 as promising candidates for next-generation spintronic devices, also highlight the critical role of chemical environment in sculpturing the structural dimension and spin-polarized property of chiral perovskites.

1.5D Chiral Perovskites Mediated by Hydrogen‐Bonding Network with Remarkable Spin‐Polarized Property

In this study, we developed new chiral hybrid perovskites, (R/S‐MBA)(GA)PbI4, by incorporating achiral guanidinium (GA+) and chiral R/S‐methylbenzylammonium (R/S‐MBA+) into the perovskite framework. The resulting materials possess a distinctive structural configuration, positioned between 1D and 2D perovskites, which we describe as 1.5D. This structure is featured by a hydrogen‐bonding‐network‐induced arrangement of zigzag inorganic chains, further forming an organized layered architecture. The structural dimensionality affects both electronic and spin‐related properties. Density functional theory (DFT) calculations reveal Rashba splitting induced by the inversion asymmetry of the crystal structure, while circularly polarized transient absorption spectroscopy confirms spin lifetime on the nanosecond timescale. Magnetic conductive‐probe atomic force microscopy (mCP‐AFM) measurements demonstrate exceptional chiral‐induced spin selectivity (CISS) with maximum spin polarization degrees of (92 ± 1)% and (‐94 ± 2)% for (R‐MBA)(GA)PbI4 and (S‐MBA)(GA)PbI4, respectively. These findings underscore the potential of (R/S‐MBA)(GA)PbI4 as promising candidates for next‐generation spintronic devices, also highlight the critical role of chemical environment in sculpturing the structural dimension and spin‐polarized property of chiral perovskites.

Distinct photon-ALP propagation modes

Measurement of cosmic photons may reveal their propagation in the interstellar environment, thereby offering a promising way to probe axions and axion-like particles (ALPs). Numerical methods are usually used to compute the propagation of the photon-ALP beam due to the complexity of both the interstellar magnetic field and the evolution equation. However, under certain conditions, the evolution equation can be greatly simplified so that the photon-ALP propagation can be analytically solved. By using analytic methods, we find two distinct photon-ALP propagation modes, determined by the relative magnitude of the photon-ALP mixing term in comparison to the photon attenuation term. In one mode, the intensity of photons decreases with the increasing distance; in the other mode, it also exhibits oscillatory behavior. To distinguish the two propagation modes, we compute the observable quantities such as the photon survival probability and the degree of polarization. We also determine through analytic methods the conditions under which maximum polarization can be observed and the corresponding upper bound of the survival probability.

Synthesis and characterization of Cobalt-chromium based alloys via spark plasma sintering for biomedical applications

The present study investigates the impact of Mo and Nb on the characteristics of CoCr sintered alloys, with a specific focus on their potential for biomedical applications. Cobalt-chromium-based alloys (namely, Co-Cr-2.5Mo-2.5 Nb, Co-Cr-3Mo-3 Nb, and Co-Cr-3.5Mo-3.5 Nb) were fabricated using sintering conditions comprising a heating rate of 200 °C/min, pressure of 50 MPa, temperature of 1100 °C, and a dwell period of 15 minutes. The findings indicated that the CoCr alloy, when supplemented with Mo and Nb, exhibited a singular-phase composition consisting mostly of a face-centered cubic (FCC) core comprised of gamma-Co, accompanied by a minor proportion of a hexagonal close-packed (HCP) solid solution matrix known as epsilon-Co, and interspersed with precipitates. The inclusion of Co-Cr-3Mo-3 Nb alloy composition resulted in the highest relative density of 97.56 % compared to other alloy compositions, indicating its optimum alloying properties. The Co-Cr-3Mo-3 Nb alloy had the maximum polarization resistance of 522.52 Ω, indicating a strong resistance to corrosion. Additionally, it displayed the least corrosion rate of 1.5904 mm/year. The ternary alloy consisting of Co-Cr-3.5Mo-3.5 Nb demonstrated superior resistance to the applied indentation stress, as shown by its minimal maximum penetration depth of 372.23 nm and the lowest average coefficient of friction (COF) values.

Dynamically switchable multifunctional device for terahertz application using vanadium dioxide and graphene-based metasurface

Abstract In this article, a dynamically switchable and multifunctional metasurface is realized using a combination of vanadium dioxide (VO2) and graphene-based structures. The device can be tuned using the temperature transition property of vanadium dioxide from a wideband linear-to-circular polarization converter (LTCPC) to a wideband linear-to-linear cross polarization converter (LTLPC) and a dual-band absorber. The unit cell is designed with a gold-backed lossy-silicon dioxide (SiO2) substrate with a permittivity of 3.9, and the top metasurface layer is designed with a graphene-based dual triangle loaded split ring (DTLSR) and two stripes of vanadium oxide to cover the split partially. The proposed device can be used as a wideband LTCPC at normal temperature (298 K) from 1.43 THz to 2.85 THz, i.e., 66.35% fractional bandwidth (FBW). At temperatures greater than 341 K, VO2 exhibits metallic properties, and the structure functions as LTLPC from 1.82 THz to 3.31 THz (PCR ≥ 80%), i.e., 58.08 % FBW and maximum polarization conversion ratio (PCR) reported as high as 99.65 %. Furthermore, at this metallic condition, two absorption peaks are obtained at 1.22 THz and 3.30 THz with absorptivity of 93.5% and 100%, respectively. The device offers incident angle invariability up to 40° for LTCPC and up to 50° for LTLPC operation. Further insight into the mechanism of operation is developed using the surface current density and electric field distribution analysis. The advantage of the proposed metasurface over other similar structures is assessed with respect to multifunctional behavior, bandwidth, and stability under oblique incidence.

Superior Temperature Sensing and Capacitive Energy-Storage Performance in Pb-Free Ceramics.

The ultrafast charge/discharge rate and high power density (PD) endow lead-free dielectric energy storage ceramics (LDESCs) with enormous application potential in electric vehicles. However, their low energy storage density and single energy storage performance (ESP) limit their further development and applicability in rugged environments. Here, through the design of vacancy defects and phase structure regulation, Pb-free (Bi0.5Na0.5)TiO3-based ceramics with an optimal composition can achieve a large maximum polarization (>44 µC cm-2) under a moderate electric field (410kV cm-1), resulting in an extremely high recoverable energy storage density (≈6.14 J cm-3), nearly ideal energy storage efficiency (91.32%), a very short time (≈67ns) to release 90% of the energy, and a high PD (243.57 MW cm-3). More importantly, the energy storage capacities of these ceramics remain stable over a wide temperature range (25-220 °C) and for a wide range of fatigue cycles (1-106). Additionally, the real-time temperature sensing performance with high sensitivity (with a relative sensitivity of up to ≈0.04 K-1) in the ceramics is developed based on Yb3+ and Tm3+ codoping, which further supports the potential application of LDESCs to automotive batteries with a temperature monitoring function.

Dust-insensitive smoke detector based on plasmon-polariton photodetector

In this study, a smoke detector based on plasmon-polariton photodetector (PPPD) is proposed to address the issue of false triggering in optical smoke detectors under conditions of high room dustiness. The proposed detector uses a PPPD based on a p-n junction in a silicon wafer, on which a metal grating is fabricated by interference photo-lithography technology for surface plasmon-polariton resonance excitation. The design of the smoke detector based on PPPD has been developed to enable the production of a relatively compact and inexpensive device. As a result of optimizing the PPPD parameters, the following characteristics of experimental samples with Au and Al gratings were achieved: the maximum polarization sensitivity Ip /Is ranging from 3 to 8, the spectral and angular half-widths of the photocurrent resonance range from 50 to 200 nm and from 5° to 10°, respectively, and photosensitivity at the resonance maximum Iph = 0.04...0.1 A/W.

Enhanced dielectric and ferroelectric properties near the morphotropic phase boundary in BNBT-BSN ceramics prepared by the solid-state combustion technique

The effect of firing temperatures on the phase structure, microstructure, and electrical properties of 0.99Bi0.47Na0.47Ba0.06TiO3-0.01BaSn0.70Nb0.24O3 (abbreviated as BNBT-BSN) lead-free ceramics fabricated by the solid-state combustion technique, with glycine used as the fuel, were investigated. All BNBT-BSN samples were calcined at temperatures ranging from 750 to 850 °C for 1 to 4 h and sintered at temperatures from 1100 to 1200 °C for 2 h. A pure perovskite structure was obtained after calcination at 800 °C for 2 h. The X-ray diffraction (XRD) patterns showed the coexistence of rhombohedral and tetragonal phases in all ceramics. The average grain size tended to increase with rising sintering temperatures. The optimal condition for fabricating BNBT-BSN ceramics with a morphotropic phase boundary (MPB) was observed at a sintering temperature of 1175 °C for 2 h, where the material exhibited the highest measured density (5.50 g/cm3), maximum dielectric constant at Tm (ɛm = 6513), maximum polarization (Pmax = 42.21 µC/cm2), the largest bulk resistivity (ρ = 1.70 × 104) and the highest activation energy of conduction (Ea = 1.52 eV). These features suggest that this ceramic is a suitable material for applications in actuators, transducers, and high-performance capacitors.

Theoretical and experimental study on optical polarization states in overhead optical cables under complex weather conditions such as real lightning

Abstract By analyzing the changes in three Stokes vectors, the trajectory of polarization state on the Poincaré sphere, and the polarization change rate, both theoretical and practical aspects of polarization state variations in signal light within optical fiber composite overhead power ground wires (OPGWs) during real thunderstorm conditions, were examined. Our findings reveal that lightning and mechanical vibrations both impact the polarization state of the signal light in OPGW. Theoretical models demonstrate that lightning induces polarization changes through the Faraday magneto-optic effect and exhibits nonlinear electro-optic effects, leading to a maximum polarization change rate of Mrad s−1. In contrast, mechanical vibrations cause long-term, low-intensity polarization rate changes, with a maximum polarization rate of Krad s−1, highlighting a significant optical birefringence effect. Digital signal processing algorithms for coherent receivers with over 100G polarization multiplexing provide valuable guidance for recovering polarization states.

Enhanced energy storage performance in BaZrxTi1–xO3 lead-free ferroelectrics near phase transitions

The present study explores the energy storage properties of BaZrxTi1-xO3through phase-field modeling, focusing on the impact of composition and temperature on energy storage performance. The obtained results reveal a variety of polarization phases and configurations based on Zr compositions and temperatures. A detailed phase diagram for temperature-composition of BaZrxTi1-xO3is established, closely aligning with experimental measurements. Variations in Zr content and temperature have a significant impact on the polarization-electric field (P - E) response, influencing the energy storage properties. Calculations of energy storage properties are derived from theP - Eresponse. In addition, a thorough diagram is developed to illustrate the discharge energy density of BaZrxTi1-xO3as a function of temperature and composition. Notably, high discharge energy density is achievable near the Curie temperature, corresponding to the transition from ferroelectric to paraelectric phase. Furthermore, the present study emphasizes the importance of the disparity between maximum and remanent polarization, as well as the electric field-dependent effective permittivity, in determining the discharge energy density.

Polarization stability and its influence on electrocaloric effects of high entropy perovskite oxide films

In principle, the configurational entropy inherent in High Entropy Oxides (HEOs) could facilitate large electrocaloric effects (ECE) by promoting polar entropy. In this study, it is demonstrated that the time stability of the remanent polarization can be tuned via B-site disorder in High Entropy Perovskite Oxides (HEPO) films. Eight HEPO powders were synthesized; the propensity for perovskite phase formation was consistent with the Goldschmidt tolerance factor. While entropic contributions stabilize HEPO, they do not fully predict the stabilization. Relative dielectric permittivities between 2000 and 600 can be achieved for the B-site disordered HEPO films with loss tangents below 6 % at room temperature. All films showed similar polarization-electric field loops with maximum polarization up to 48 μC cm−2 and a remanent polarization ≥ 20 μC cm−2 measured at room temperature with applied electric field of 1100 kV cm−1 at a frequency of 10 kHz. The temperature of the dielectric maximum (Tmax) increased from 105 °C to 225 °C with increasing average ion size on the B-site. Polarization stability of the HEPO films was investigated using Positive-Up-Negative-Down (PUND) measurements. It was found that in some HEPO films, 24 % of the remanent polarization decayed within 2 s. By employing the time stability of the remanent polarization, enhanced electrocaloric effects of HEPO film was predicted to be 14.9 K and 11.5 J Kg−1K−1 at an applied field of 1120 kV cm−1, for electrocaloric temperature change and entropy change, respectively.

Enhanced energy storage performance of NaNbO3-based ceramics by modifying phase structures and electrical insulation

The remarkable polarization and stability of ceramic capacitors make them promising candidates for pulse-power devices in energy-storage systems. However, the energy-storage density of ceramic capacitors is severely limited by the negative correlation between the maximum polarization (Pm) and the breakdown strength (BDS), leading to the impediment of broader applications. Herein, we reconcile the contradiction by synthesizing high-performance NaNbO3-based ceramics via chemical doping with Bi(Ni0.5Ti0.25Zr0.25)O3 (BNTZ). An antiferroelectric-paraelectric phase transition with a decline in polarization hysteresis is induced by the dopant. Further studies have shown that the existence of a tiny quantity of the polar phase in the nonpolar matrix contributes to a higher Pm, and the enhancement of both electrical resistivity and activation energy of the conductance also improved their BDS. The thinning process is also identified to be important in the improvement of its BDS and Wrec, resulting in the maximum energy-storage density of 3.53 J/cm3 with an energy efficiency of 74.2 % in thinned 10 mol% BNTZ-doped NaNbO3 samples. Our findings provide a feasible approach to simultaneously improving energy-storage density and efficiency in NaNbO3-based ceramic capacitors.

Double enhancement of energy storage density in relaxor ferroelectric 0.8BaTiO3-0.2BiScO3 by Li defect-regulated strategy

To meet the ever-increasing demands for pulsed power technologies, the development of lead-free dielectric ceramics with a large energy storage density (Wrec) and high energy storage efficiency (η) is crucial for enhancing the electrical performance of power capacitive devices. The conventional solid-solution, while effective in suppressing long-range order and improving energy storage performances, often results in a reduction of maximum polarization. This reduction necessitates the application of a larger electric field to obtain a relatively high Wrec. Herein, an effective strategy to enhance Wrec again via inducing Li-related defect dipoles is proposed. By introducing (Bi0.5Li0.5)TiO3 into 0.8BaTiO3-0.2BiScO3 matrix, the polarization contribution from defect dipoles together with intrinsic polarization induces an at least two-time enhancement in Pmax. Our findings indicate ∼62.9 % enhancement in the Wrec of 0.8BT-0.2BS, elevating from 2.56 J cm−3 to 4.17 J cm−3 at electrical field of 300 kV cm−1, while preserving an energy storage efficiency of 90.35 %. Furthermore, it also exhibits good thermal stability with the variations of ΔWrec < 3 % and η< 5 %. This research introduces a novel strategy for defect regulation strategy in the design of high-performance dielectric materials, which is expected to expedite the optimization of the advanced energy storage capacitors.

Machine learning-guided design of direct methanol fuel cells with a platinum group metal-free cathode

Direct methanol fuel cells (DMFCs) offer a promising solution for clean electricity generation, particularly in small electronics and remote auxiliary power units. However, optimizing their efficiency and performance is challenging due to the complex interactions between various factors. Here, we present a novel approach that integrates experiments with machine learning to model and predict the performance of these fuel cells using atomically dispersed platinum group metal (PGM)-free catalysts at the cathode. Our machine learning models, trained on diverse input parameters, allow for the comprehensive optimization of DMFC performance prior to fabrication and testing. Through extensive experimental validation, we demonstrate that this data-driven approach accurately predicts key performance metrics, such as maximum power output and polarization curves. By combining our models with interpretable game-theory methods, we provide deep insights into the factors governing fuel cell performance, ultimately paving the way for the design of scalable and efficient DMFC technologies.

STUDY OF THE CORROSION BEHAVIOR OF Co-W COATINGS IN VARIOUS ENVIRONMENTS

Corrosion behavior of So-W coatings obtained from citrate electrolyte (with W content in the coating of about 24 att. %) in the following corrosive environments was studied by the methods of electrochemical impedance and polarization measurements: 0.6M sodium chloride (3.5 mass%), 0.1 M sodium sulfate (Na2SO4), 1 M hydrochloric acid (HCl) and 0.5M sulfuric acid (H2SO4). As a comparison, JIS-SK5 steel, which acts as a substrate during deposition, was taken. It is shown that the corrosion current of Co-W coatings in three corrosive media (sodium chloride, hydrochloric acid and sodium sulfate) is close to 20±3 µA/cm2. When exposed to acidic environments, the corrosion potential of Co-W coatings shifts to the anodic region reaching values of -0.260 V, and in neutral environments (chloride and sulfate) it reaches significantly higher values of -0.76 V. The high passivating ability of the Co-W coating in used acids is demonstrated, where the corrosion current is more than 100 times (in the case of sulfuric acid) and 17 times (in the case of hydrochloric acid) less than that of the SK-5 steel substrate. The maximum polarization resistance of So-W coatings is observed in sodium chloride and sulfuric acid environments and takes a maximum value of ~36000 Ohm·cm2, and the minimum value of this coating shows ~3500 Ohm·cm2 in hydrochloric acid environment. For citation: Silkin S.A., Kusmanov S.A., Perkov A.S., Parfenyuk V.I. Study of the corrosion behavior of Co-W coatings in various environments. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2024. V. 67. N 11. P. 69-78. DOI: 10.6060/ivkkt.20246711. 7033.