Formation Of Orthorhombic Phase Research Articles

Improved ferroelectric characteristics of ALD lanthanum-doped hafnium oxide thin film by controlling post-cooling time

A study was conducted on how the subsequent cooling time affects the ferroelectric (FE) characteristics of atomic layer deposited (ALD) lanthanum (La) doped HfO2 thin films after the crystallization heat treatment in the form of TiN/La-doped HfO2/TiN metal-ferroelectric-metal (MFM) device structure. The ALD La-doped HfO2 thin film was cooled to room temperature in a chamber (“chamber cooling” - slower cooling) or in an air atmosphere (“air cooling” - faster cooling). Based on the polarization vs electric field (P-E) hysteresis curve, the double remanent polarization (2Pr) values of the chamber cooling and air-cooling are 9.5 μC/cm2 and 40 μC/cm2, respectively. This drastic improvement stems from more orthorhombic phase formation within La-doped HfO2 thin film, which is confirmed by smaller grain size, higher amount of oxygen vacancies, and more tensile stress within HfO2 thin film. Our results suggest that FE properties of La-doped HfO2-based thin film can be significantly modulated by post cooling processes.

Microwave assisted synthesis, photoluminescence and X-ray/gamma ray absoprtion properties of red CaZrO3:Eu3+ perovskite

Nanocrystalline orthorhombic CaZrO3:Eu3+ (1–4 ​mol%) perovskite was synthesized by microwave assisted combustion method. To know the phase purity, functional group, surface morphology, structural analysis and energy band gap, the synthesized sample was characterized by using various techniques. The powder X-ray diffraction analysis clearly confirms the formation of pure orthorhombic phase of CaZrO3:Eu3+ (1–4 ​mol%) nanoparticles. The surface morphology shows the formation of voids and pores which is the characteristic of combustion method. The d-spacings, selected area electron diffraction pattern and the crystallite size obtained from transmission electron microscopic analysis matches well with that of X-ray diffraction pattern.The optical energy band gap determined from Wood and Tauc's relation decreases with decrease in crystallite size and with increase in dopant concentration. The photoluminescence emission excited at 306 ​nm wavelength shows the characteristic peaks of Eu3+ ions. CIE and CCT coordinates clearly shows that CaZrO3:Eu3+ (1–4 ​mol%) nanophosphor is one of the promising candidate for display applications. Further, the interaction of X-ray/gamma radiation with CaZrO3:Eu3+ is also studied. We have reported the X-ray/gamma radiation interaction parameters such as mass attenuation coefficient and other parameters at different energies. The established data may be useful in the fields of radiation protection. Calcium and Zirconium being heavier elements, there is an expectation that, the CZ perovskite might be a good X-ray/gamma ray absorber and hence X-ray/gamma ray interaction parameters are discussed.

Damage-Induced Ferroelectricity in HfOx-Based Thin Film

In the last decade, a surge in research on hafnium oxide (HfO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> )-based ferroelectricity has become a significant part of the semiconductor research trend. In this work, we present a new factor, that is, process damage to the HfO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> -based ferroelectric implementation. By reversely exploiting harmful damage in the metal-oxide-semiconductor process, the ferroelectricity in HfO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> is improved by eliciting early amorphization suitable for orthorhombic phase formation. In addition, through various pulsed polarization measurements, it is found that the damaged HfO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> film has a fast polarization switching speed, with an initial pinning site that is suitable for domain wall growth motion; advantageous for high-performance memory applications.

The decisive factor of hollow spherical network morphology of Nd1-xCexCo1-yCuyO3±δ perovskites towards soot oxidation

The perovskites Nd1-xCexCo1-yCuyO3 (x = 0–0.05, y = 0–0.1) have been synthesized using PVP-assisted sol–gel method and applied for soot oxidation reactions. XRD technique reveals the formation of orthorhombic phase with crystal volume of around ~ 214 Å3 and crystal size of ~ 25–40 nm. The interconnected nanoparticles with hollow spherical network morphology of particles are observed for the samples NdCoO3 (NC1) and Nd0.98Ce0.02Co0.95Cu0.05O3 (NC2) with particle sizes of around 300–500 nm. The samples experienced a charge transfer from ligand (O2−) to cobalt cation in UV region (210–260 nm) and also observed broad absorption bands in the visible region (380–600 nm). In addition, the bandgap energy of NC2 showed the lowest value (4.21 eV); as well as surface morphological advantage promoted the transport of surface-chemisorbed oxygen species in the inner and outer surface of catalysts surface due to the reducibility of the catalyst with the soot left( {frac{{{text{O}}_{2}^{{{text{x}} - }} }}{{{text{O}}_{2}^{{{text{x}} - }} + {text{O}}^{2 - } }} = 0.90} right). Furthermore, XPS results evidenced the higher content of Co2+ cation upon substitution of Ce/Cu into NC1, which successively formed more amount of Oβ-oxygen species. Remarkably, the perovskite NC2 showed the lowest soot oxidation temperature (T50% = 434 °C) among the investigated perovskites. Besides, the spherically networked morphology of NC2/NC1 samples also decided the soot oxidation process.

Ferroelectric properties of ZrO2 films deposited on ITO-coated glass

In this work, the ferroelectric characteristics of ZrO2 thin films grown on ITO-coated glass have been investigated. The ferroelectric nature of the ZrO2 films has been studied by polarization-electric field (P-E) hysteresis loops and found to be optimum for the films processed by rapid thermal annealing at 600 °C. The increase in the annealing temperature improves the ferroelectric properties through the increase of the in-plane strain that causes the formation of the ferroelectric orthorhombic phase. The formation of the orthorhombic phase was confirmed through high-resolution transmission electron microscopy. The effect of the electric field on the polarization switching kinetics of ZrO2 films has been investigated revealing that the switching kinetics follows the nucleation limited switching (NLS) model. The activation fields estimated from the peak values of the polarization currents (im) and the time (tm) at which im occurs are in good agreement with the values obtained from the switching characteristic time of the NLS model. This work paves the way towards the integration of (pseudo)-binary oxide thin films on cheap substrates like glass for the next-generation of non-volatile memories.

Pressure induced phase transitions in Sm-doped BiFeO3 in the morphotropic phase boundary

Sm-doped BiFeO3 compacted powders with composition across the morphotropic phase boundary region were prepared by sol-gel method. Crystal structure, morphology and magnetic state of the compounds were analyzed as a function of dopant concentration, temperature and external pressure using synchrotron and laboratory X-ray diffraction, electron microscopy, Raman and Mössbauer spectroscopy. Application of external pressure shifts the phase transition from the rhombohedral structure to the nonpolar orthorhombic structure towards lower concentration of the dopant content, wherein the amount of the anti-polar orthorhombic phase notably decreases. Raman and Mössbauer spectroscopy data provides additional information about the structural distortion on local scale level which testifies faster formation of nonpolar orthorhombic phase and associated modification in the magnetic state in the compounds subjected to high pressure. Temperature increase leads to the structural transition to the nonpolar orthorhombic phase regardless the structural state at room temperature; furthermore, application of external pressure decreases the phase transition temperature.

Impacts of surface nitridation on crystalline ferroelectric phase of Hf1-xZrxO2 and ferroelectric FET performance

This paper presents an approach to enhance Hf0.5Zr0.5O2 (HZO) ferroelectric orthorhombic phase (O-phase) formation via in situ NH3 plasma treatment. High-resolution non-disruptive hard x-ray photoelectron spectroscopy confirmed that O-phase formation can be enhanced by suppressed interfacial diffusion between HZO and the top TiN electrode. Additional N-bonding facilitated by NH3 treatment was shown to suppress the interaction between TiN and HZO, thereby reducing the formation of oxygen vacancies within HZO. It was shown to improve the reliability and ferroelectric performance (examined by the leakage current and positive-up-negative-down measurements) of HZO devices. After cyclic operations, NH3-treated ferroelectric FETs (FeFETs) exhibited stable transfer characteristics and memory windows, whereas untreated devices presented unstable behaviors. Our results demonstrate the efficacy of the proposed in situ NH3-treatment scheme in enhancing the stability of HZO-based FeFETs.

Concentration modulated vanadium oxide nanostructures for NO2 gas sensing

Vanadium Oxide (V2O5) nanostructures have been prepared via a simple and inexpensive hydrothermal method using ammonium metavanadate as a vanadium precursor along with oxalic acid. Present work demonstrates the effect of concentration (0.1–0.4 M) variation on gas sensing performance of hydrothermally prepared vanadium pentoxide. The structural, morphological, functional group, and optical properties of V2O5 nanostructure have been investigated by using different characterization techniques like X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infra-Red (FTIR) Spectroscopy, Raman spectroscopy, and Diffused Reflectance Spectroscopy (DRS) studies respectively. The structural analysis revealed orthorhombic V2O5 phase formation with the c-axis orientation along (001) plane. The SEM images revealed platelet-like nanostructures, agglomerated nano structure, and clusters of elongated nano structure. The variation in band gap from 2.06 to 2.14 eV is observed with a change in precursor conc. The BET study indicates good specific surface area and optimum pore diameter. The Photoluminescence shows a centered peak arising at characteristic wavelength 709.25 nm and some other peaks observed at 540.91 nm, 470.86 nm and 391.50 nm which is good for gas sensing application. The sensing selectivity was high for NO2 gas detection at 150 °C. All samples revealed good response with fast response and recovery time. Sample prepared with 0.3 M concentration exhibited the best response attributed to optimum pore size and high surface area which governs superior sensing features. The response of V2O5 is found to be 13% towards 100 ppm NO2 gas, while response and recovery time is 4 and 55 s respectively. The present work depicts the results of NO2 gas sensing with fast response and recovery time at relatively low working temperature (150 ℃). Hence it explores the use of this material as a potential candidature for the fabrication of vanadium oxide-based gas sensors.

3D, large-area NiCo2O4 microflowers as a highly stable substrate for rapid and trace level detection of flutamide in biofluids via surface-enhanced Raman scattering (SERS).

A one-pot hydrothermal synthesis of three-dimensional (3D), large-area, bimetallic oxide NiCo2O4 (NCO) microflowers has been developedas a novel substrate for surface-enhanced Raman scattering (SERS) detection of flutamide in biological fluids. The 3D flower-like morphology of the NCO is observed via FESEM micrographs, while the orthorhombic phase formation is confirmed through XRD spectra. Due to the presence of multiple coordination cations of the 3D NCO microflowers (such as Ni2+ and Co2+), the high surface area and surface roughness, the NCO-modified indium tin oxide (NCO/ITO) SERS substrate exhibits a linear detection range from 0.5-500nM with a low limit of detection (LOD) of 0.1nM. The SERS substrate provides a high enhancement factor of 1.864 × 106 with an accumulation time of 30s using a laser source of λ = 532nm, which can be ascribed to the excellent and rapid interaction between the flutamide molecule and the NCO microflower substrate that leads to photoinduced charge transfer (PICT) resonance. The NCO/ITO substrate exhibits excellent homogeneity and high chemical stability. Besides, the substrate displays an excellent selectivity to flutamide molecules in the existence of other metabolites such as urea, ascorbic acid (AA), glucose, NaCl, KCl, CaCl2, and hydroxyflutamide. The NCO/ITO substrate is successful in the trace-level detection of flutamide in simulated blood serum samples. The strategy outlined here presents a novel strategy for the efficacy of transition metal oxides (TMOs) based electrodes useful for a wide variety of bioanalytical applications.

Potential of Nb2O5 nanofibers in photocatalytic degradation of organic pollutants.

Various photocatalytic nanomaterials for environmental remediation have been promoted due to the pollution caused by different organic pollutants. In this study, Nb2O5 nanofibers were obtained by electrospinning technique, presenting controlled crystallinity and high specific surface area to improve the photoactivity response. The structural characterization indicated Nb2O5 nanofibers with orthorhombic phase formation. The photoluminescence measurements showed different energy levels contributing to the electronic transition events. The nanofibers with a bandgap up to 3.6 eV were applied to photocatalysis of dyes (rhodamine B (RhB) or methylene blue (MB)) and fluoxetine (FLX), listed as an emergent pollutant. In the optimized condition (pH = 9), the RhB and MB photocatalysis was 59% and 93% more efficient than photolysis due to ζ = - 50 mV ± 5 for EtOH_550 sample increased interaction with MB (cationic) compared to RhB unprotonated (pKa = 3.7). Therefore, FLX (pKa = 10.7) was selected due to protonated form at pH = 9 and showed 68% ± 1 adsorption in 30 min for EtOH_550. The FLX photocatalytic degradation under UV light irradiation was up to 17% higher than the photolytic degradation. The formation of hydroxyl radicals in the photocatalytic system (EtOH_550) was proven by the Coumarine probe assay, corroborating with the greater amount of α-[2-(methylamino)ethyl]benzylalcohol (MAEB), a by-product obtained after FLX oxidation. Additionally, the material achieved specific catalytic activity for the different organic compounds (RhB, MB, or FLX). Therefore, Nb2O5 nanofibers were efficient for degrading three different pollutants under UV light, proving a viable alternative for environmental remediation.

Impact of in/ex situ annealing and reaction temperature on structural, optical and electrical properties of SnS thin films

In this work, SnS thin films were prepared by in situ and ex situ annealing process of precursor films deposited by RF (Radio Frequency) magnetron sputtering employing binary SnS target. In situ annealing treatment was performed in sputtering chamber and ex situ annealing treatment was performed using RTP (Rapid Thermal Processing) system under Ar+H2 mix gas employing 225, 300 and 375 °C as reaction temperatures in order to find out the best fabrication parameters of SnS thin film since it has been used as an absorber layer in the cell structure. The EDX (Energy Dispersive X-ray Spectroscopy) measurements showed that precursor and reacted films have almost stoichiometric composition except for in situ annealed sample at 375 °C. XRD (X-ray Diffraction) patterns of all samples revealed orthorhombic SnS phase regardless of annealing route and temperature. In addition to SnS phase, formation of SnS2 phase was observed in in situ annealed SnS samples at 225 and 300 °C. Moreover, in situ annealed samples displayed larger crystallite size and lower micro strain compared to ex situ annealed samples. Raman spectra of the samples confirmed formation of orthorhombic SnS phase and it was also seen that crystalline quality gave rise to shift in position of Raman bands for some samples. Only a SEM (Scanning Electron Microscopy) image of in situ annealed sample at 375 °C displayed distinct surface morphology. Optical band gap values of the samples showed variation between 1.35 and 1.66 eV. Electrical characterization of the films showed that resistivity values changed from 3.34×103 to 2.28×104 Ω-cm and carrier concentration values changed from 1.34×1014 to 1.05×1015 cm−3. It was seen that in situ annealing at 375 °C exhibited more promising results for potential SnS based photovoltaic applications.

Structural, dielectric relaxation and magnetic features of the (La0.8Ca0.2)0.9Bi0.1Fe1−yTiyO3 (y = 0.0 and 0.1) nanoparticles

Two nanoparticle orthoferrite materials (La0.8Ca0.2)0.9Bi0.1Fe1−yTiyO3 (y = 0.0 and 0.1) have been successfully synthesized via the assisted ball milling solid-state reaction. The effect of Bismuth and Titanium ions insertion in A and B-sites of La0.8Ca0.2FeO3 material on structural, dielectric relaxation and magnetic properties was conducted. Structural study reveals the formation of majoritarian orthorhombic phase in both nanomaterials. Importantly, both compounds present a giant dielectric constant ε’ and low dielectric loss tangent tg(δ). Two relaxation processes have been detected at low and high-temperature ranges. The adjustment of the imaginary parts of complex Modulus via the Havriliak-Negami formalism (H-N) confirms a Cole-Cole (grains) and Cole-Davison (grain boundaries) relaxation processes at low and high temperature regions, respectively. The magnetic study reveals the enhancement of magnetization when introducing Titanium ions in B-site which increases the Ferromagnetic interactions. It also confirms an important decrease in the Curie Weis temperature (TC = 450 K).

Investigation on interatomic chemical bonding and charge-related optical, multiferroic properties of La1−xZnxFeO3 bulk ceramics

A series of Zn-substituted La1−xZnxFeO3 (x = 0.00, 0.05, 0.15, and 0.25) bulk ceramics was prepared using solid-state reaction method. The XRD patterns and profile refinements confirm the orthorhombic phase formation in La1−xZnxFeO3. The charge density distribution in the La1−xZnxFeO3 unit cells were analyzed qualitatively and quantitatively. The average particle size and energy band gap were determined using the SEM images and UV–Visible absorption spectra. The magnetic hysteresis (M − H) curves show weak ferromagnetic order and shift in the hysteresis curves. The Zn-substituted system (x = 0.25), exhibits relatively high dielectric constant with low dielectric loss. Ferroelectric measurements show the rectangular-like P-E loops with Barkhausen jumps. In this work, the effect of Zn-substitution on the crystal lattice and hence the modified optical, and multiferroic properties of LaFeO3 have been examined through charge density analysis which has not been investigated so far.

Luminescence and structural properties of ytterbium and erbium co-doped LaGaO3 nanophosphor for up-conversion by polyol method

Ytterbium and erbium co-doped lanthanum gallate (LaGaO3) up-conversion phosphors have been synthesized using polyol method followed by heating at 1000°C. From Fourier transform infrared (FTIR) spectroscopy and thermal analysis studies of as prepared sample, formation of hydroxy carbonate precursor has been confirmed. This precursor undergoes two step decomposition leading to the formation of LaGaO3 phase. Detailed X-ray diffraction studies confirmed the formation of orthorhombic LaGaO3 phase with distorted GaO6 octahedra and distorted LaO12 cuboctahedra. As the annealing temperature increased from 1000°C to 1200°C, green to red ratio (GRR) as well as lifetime values increased and this is explained based on the increase in crystallite size from 40 nm to 95 nm and associated decrease in the extent of quenching (non-radiative) processes. Variation in the “n” values accounts for the observed increase in the GRR values corresponding to 1000°C and 1200°C annealed samples with increase in laser power.

Ferroelectric Phase Content in 7 nm Hf(1−x)ZrxO2 Thin Films Determined by X‐Ray‐Based Methods

The recent discovery of ferroelectric behavior in hafnia‐based dielectrics attributed to the formation of noncentrosymmetric orthorhombic phase has opened up potential uses in numerous applications ranging from ferroelectric field effect transistors to pyroelectric energy harvesters. Herein, the relative amounts of ferroelectric orthorhombic phase (space group Pca21) in 7 nm‐thick hafnia–zirconia (HZO) films of three compositions (Hf0.2Zr0.8O2, Hf0.5Zr0.5O2, and Hf0.8Zr0.2O2) are reported. The ferroelectric behavior in these ultrathin HZO films prepared by atomic layer deposition (ALD) in metal–insulator–metal (MIM) stacks is verified by polarization measurements. Using grazing incidence X‐ray diffraction (GIXRD) and grazing incidence‐extended X‐ray absorption fine structure spectroscopy (GI‐EXAFS), the relative phase percentages of three key phases (monoclinic—P21/c, orthorhombic—Pca21, and tetragonal—P42/nmc) are assessed. Among these compositions, Hf0.5Zr0.5O2 is determined to have the highest amount of the ferroelectric phase. The monoclinic phase is found to be dominant for Hf0.8Zr0.2O2, whereas the tetragonal phase is found to be dominant for Hf0.2Zr0.8O2. Independent GI‐EXAFS measurements of Hf and Zr suggest that there is no significant segregation of either oxide into a particular crystal phase. Strong agreement between the measurement methods reveals the structure–property function correlation in these ultrathin hafnia–zirconia films with greater certainty than previously achieved.

Screening for O phase in advanced γ–TiAl alloys

This is a screening study using high-energy X-ray diffraction measurements to determine whether an orthorhombic phase forms in γ-based TiAl alloys of different compositions. The 13 alloy compositions investigated were chosen to be either close to commercial alloys or to identify the effects of different single alloying elements on the formation of orthorhombic phase. The orthorhombic O phase with Cmcm structure was found in several of those γ-TiAl alloys after an aging heat treatment at 550 °C for 20 h. The presence of different β-stabilising elements such as niobium, tantalum, molybdenum or vanadium did promote the formation of orthorhombic phase, while micro alloying elements such as carbon or boron were neutral in this respect. Furthermore, a limit for aluminium was also found, below which the orthorhombic O phase is formed in the alloys investigated. This limit lies between 46 at.% and 47 at.%.

Influence of Al3+ doping for V5+ on the structural, optical, thermal and electrical properties of V2-xAlxO5-δ (x=0–0.20) ceramics

This paper reports an investigation on the structure-properties correlation of trivalent metal oxide (Al2O3)-doped V2O5 ceramics synthesized by the melt-quench technique. XRD patterns confirmed a single orthorhombic V2O5 phase formation with increasing strain on the doping of Al2O3 in place of V2O5 in the samples estimated by Williamson-Hall analysis. FTIR and Raman investigations revealed a structural change as [VO5] polyhedra converts into [VO4] polyhedra on the doping of Al2O3 into V2O5. The optical band gap was found in a wide semiconductor range as confirmed by UV–visible spectroscopy analysis. The thermal and conductivity behavior of the prepared samples were studied using thermal gravimetric analysis (TGA) and impedance analyzer, respectively. All the prepared ceramics exhibit good DC conductivity (0.22–0.36 Sm-1) at 400 ᵒC. These materials can be considered for intermediate temperature solid oxide fuel cell (IT-SOFC)/battery applications due to their good conductivity and good thermal stability.

One Pot Hydrothermal Synthesis of Large Area Nano Cube Like ZnSnO3 Perovskite for Simultaneous Sensing of Uric Acid and Dopamine Using Differential Pulse Voltammetry

We report ultra-selective zinc stannate nano cubes (ZnSnO3) modified glassy carbon electrode (GCE) for simultaneous detection of Uric Acid (UA) and Dopamine (DA) using differential pulse voltammetry (DPV) technique. The ZnSnO3 nano cubes were synthesized via one-pot hydrothermal technique. The orthorhombic phase formation of nano cubes structured ZnSnO3 was confirmed through X-ray diffraction (XRD) and scanning electron microscopy (SEM) imaging. The sensor exhibited very distinct oxidation potentials and excellent sensitivity with wide dynamic ranges of detection ranging from 10 nM to $5~\mu \text{M}$ and $1~\mu \text{M}$ to 5 mM with a very low limit of detections of 2.6 nM and 550 nM towards DA and UA respectively. The sensing mechanism can be ascribed to the simultaneous electro-oxidation process of DA and UA at the 3d orbital SnO6 octahedra sites facilitated with the Sn2+/Sn4+ oxidation states of Sn in line with the stress induced electrical property transformation of ZnSnO3 due to its piezoelectric nature. The as fabricated ZnSnO3/GCE sensor was further successfully evaluated for simultaneous detection of UA and DA in the simulated blood serum samples. This simple strategy for developing ZnSnO3 perovskite modified electrode paves way to develop electrochemical sensing platforms for bioanalytical applications.

Structural, Dielectric, and Energy Storage Properties of Citric Acid and Ethylene Glycol Assisted Hydrothermally Synthesized Y2FeCoO6

Citric acid and ethylene glycol assisted hydrothermal synthesis of pure‐phase double perovskite oxide Y2FeCoO6 is reported. The Rietveld refinement confirm the orthorhombic phase formation with Pnma space group symmetry and lattice parameters as, a = 5.5039 Å, b = 7.4734 Å, and c = 5.2094 Å. The high‐resolution transmission electron micrographs exhibit formation of flakes, composed of agglomerated crystallites, oriented in [121] direction. The oxidation states of Fe as Fe3+ and Co as Co2+/Co3+ are observed by X‐ray photoelectron spectroscopy. The room temperature relative permittivity, 6.8 × 104, is found to increase to 1.3 × 107 at 473 K and frequency 500 Hz. The specific capacitance of ≈31.32 F g−1 is obtained at the current density of 1 A g−1. The effective charge storage involve the redox reactions of Fe2+/Fe3+, Co2+/Co3+, and Co3+/Co4+, and excellent capacitance retention of ≈99% is achieved after 5000 charging/discharging cycles at current density of 6 A g−1.

Tantalum doping in HfO2: orthorhombic phase formation at ambient conditions and change in path of pressure-induced structural evolution

ABSTRACT A systematic study of orthorhombic phase formation at ambient conditions beyond a critical concentration of dopant Tantalum (Ta) in HfO is reported. The effect on the path of structural evolution due to Ta doping in HfO was also investigated. Studies on Ta-doped HfO samples and their path of structural evolution under compression have significant implications for materials undergoing β-decay. The effect of continual doping due to β-decay from geophysical point of view is discussed.