Pub Date : 2018-08-31DOI: 10.1080/07315171.2018.1499362
Jing Liu, Jianke Du, Ji Wang, Jia-shi Yang
Abstract We perform a theoretical analysis on thin film bulk acoustic wave piezoelectric resonators operating with high overtone thickness-extensional modes. The scalar differential equations by Tiersten and Stevens are used for the electroded and unelectroded parts of the resonator, respectively. An analytical solution is obtained for the free vibration of the resonator. Frequencies and modes are calculated based on the solution. Numerical results show that there exist modes with vibration mainly trapped under the driving electrode. The effects of the structural parameters on the behaviors of the trapping are examined.
{"title":"Trapped thickness-extensional modes in high overtone thin film bulk acoustic wave piezoelectric resonators","authors":"Jing Liu, Jianke Du, Ji Wang, Jia-shi Yang","doi":"10.1080/07315171.2018.1499362","DOIUrl":"https://doi.org/10.1080/07315171.2018.1499362","url":null,"abstract":"Abstract We perform a theoretical analysis on thin film bulk acoustic wave piezoelectric resonators operating with high overtone thickness-extensional modes. The scalar differential equations by Tiersten and Stevens are used for the electroded and unelectroded parts of the resonator, respectively. An analytical solution is obtained for the free vibration of the resonator. Frequencies and modes are calculated based on the solution. Numerical results show that there exist modes with vibration mainly trapped under the driving electrode. The effects of the structural parameters on the behaviors of the trapping are examined.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":"20 1","pages":"38 - 48"},"PeriodicalIF":0.4,"publicationDate":"2018-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89450678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-02DOI: 10.1080/07315171.2017.1397457
L. V. Simagina, T. R. Volk, Ya. V. Bodnarchuk, R. Gainutdinov, L. Ivleva
ABSTRACT We present studies of local piezoelectric hysteresis loops Hω-UDC (PFM spectroscopy method) measured in SBN crystals under square pulse trains. The dependences of the loop height, i. e., of the remnant polarization Pr, on the pulse duration tp and spacing Δt were found at tp < 1000 ms. The effects are pronounced at tp/Δt < 1, which permits us to attribute them to backswitching. For the first time, the dependence of coercive fields on Δt was revealed, which as well as the backswitching is caused by Pr instability.
{"title":"Backswitching effect in relaxor SBN crystals, studied by PFM-spectroscopy","authors":"L. V. Simagina, T. R. Volk, Ya. V. Bodnarchuk, R. Gainutdinov, L. Ivleva","doi":"10.1080/07315171.2017.1397457","DOIUrl":"https://doi.org/10.1080/07315171.2017.1397457","url":null,"abstract":"ABSTRACT We present studies of local piezoelectric hysteresis loops Hω-UDC (PFM spectroscopy method) measured in SBN crystals under square pulse trains. The dependences of the loop height, i. e., of the remnant polarization Pr, on the pulse duration tp and spacing Δt were found at tp < 1000 ms. The effects are pronounced at tp/Δt < 1, which permits us to attribute them to backswitching. For the first time, the dependence of coercive fields on Δt was revealed, which as well as the backswitching is caused by Pr instability.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":"33 1","pages":"65 - 72"},"PeriodicalIF":0.4,"publicationDate":"2017-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78338542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-02DOI: 10.1080/07315171.2017.1397460
Xuanrui Jia, Jingji Zhang, J. Wang
ABSTRACT Dielectric, ferroelectric and ferromagnetic properties of (1-x)Ba0.99Ca0.01Zr0.02Ti0.98O3 (BCZT)-xBiFeO3 (BFO) (x = 0.00, 0.05, 0.10, 0.15) ceramics have been investigated. X-ray diffraction and Raman data documented the tetragonal-to-pseudocubic phase transformation with increasing the concentration of BFO and the formation of BFO when the composition with x = 0.15 was sintered at 1100°C. Correspondingly, the samples showed a high temperature at permittivity maxima along with a weak frequency dispersion feature. Surprisingly, the composition with x = 0.15 exhibited weak ferroelectric and good magnetic properties with 2Mr∼0.60 emu/g, 2Hc∼0.36 kOe.
{"title":"Dielectric, ferroelectric and ferromagnetic properties of multiferroic (1-x)Ba0.99Ca0.01Zr0.02Ti0.98O3-xBiFeO3 ceramics","authors":"Xuanrui Jia, Jingji Zhang, J. Wang","doi":"10.1080/07315171.2017.1397460","DOIUrl":"https://doi.org/10.1080/07315171.2017.1397460","url":null,"abstract":"ABSTRACT Dielectric, ferroelectric and ferromagnetic properties of (1-x)Ba0.99Ca0.01Zr0.02Ti0.98O3 (BCZT)-xBiFeO3 (BFO) (x = 0.00, 0.05, 0.10, 0.15) ceramics have been investigated. X-ray diffraction and Raman data documented the tetragonal-to-pseudocubic phase transformation with increasing the concentration of BFO and the formation of BFO when the composition with x = 0.15 was sintered at 1100°C. Correspondingly, the samples showed a high temperature at permittivity maxima along with a weak frequency dispersion feature. Surprisingly, the composition with x = 0.15 exhibited weak ferroelectric and good magnetic properties with 2Mr∼0.60 emu/g, 2Hc∼0.36 kOe.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":"42 1","pages":"113 - 119"},"PeriodicalIF":0.4,"publicationDate":"2017-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88175413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-02DOI: 10.1080/07315171.2017.1397462
S. Singh, K. Srikanth, Bhim Singh
ABSTRACT This article presents the effect of processing parameters on the ferroelectric hysteresis behavior of [(1-x)Ba0.9Ca0.1TiO3-x(BaSn0.2Ti0.8O3)] ceramics for x = 0, 0.4, 0.45, 0.5 and 0.6 samples. The ferroelectric hysteresis scaling relations for coercive field (Ec) and remnant polarization (Pr) in the form of temperature have been proposed. The power law temperature exponents based on scaling were systematically established for the hysteresis parameters. The temperature dependent scaling of Ec and Pr at sintering temperature of 1480°C for 5 hr yields Ec α T−0.42, Ec α T−0.32, Ec α T−0.35 and Ec α T−0.34 and Pr α T−2.20, Pr α T−2.07,Pr α T−2.09 and Pr α T−2.12 respectively. Further, to analyze the domain dynamics, back switching polarization (Pbc) in terms of temperature (T) was also estimated by Arrhenius law and the average activation energy was evaluated. The maximum activation energy for domain switching is found to be 0.199 eV at 17 kV/cm for x = 0.6 sample.
本文研究了在x = 0、0.4、0.45、0.5和0.6样品下，工艺参数对[(1-x)Ba0.9Ca0.1TiO3-x(BaSn0.2Ti0.8O3)]陶瓷铁电迟滞行为的影响。提出了矫顽力场(Ec)和残余极化(Pr)的铁电迟滞以温度为标度关系。系统地建立了基于标度的滞后参数幂律温度指数。在1480℃烧结5 h时，Ec和Pr的结垢率分别为Ec α T - 0.42、Ec α T - 0.32、Ec α T - 0.35和Ec α T - 0.34,Pr α T - 2.20、Pr α T - 2.07、Pr α T - 2.09和Pr α T - 2.12。在此基础上，利用Arrhenius定律估计了温度(T)下的反向开关极化(Pbc)，并计算了平均活化能。在17 kV/cm下，x = 0.6样品的畴切换激活能最大为0.199 eV。
{"title":"Temperature dependent dynamic hysteresis scaling of ferroelectric hysteresis parameters of [(1-x)Ba0.9Ca0.1TiO3-x(BaSn0.2Ti0.8O3)] ceramics","authors":"S. Singh, K. Srikanth, Bhim Singh","doi":"10.1080/07315171.2017.1397462","DOIUrl":"https://doi.org/10.1080/07315171.2017.1397462","url":null,"abstract":"ABSTRACT This article presents the effect of processing parameters on the ferroelectric hysteresis behavior of [(1-x)Ba0.9Ca0.1TiO3-x(BaSn0.2Ti0.8O3)] ceramics for x = 0, 0.4, 0.45, 0.5 and 0.6 samples. The ferroelectric hysteresis scaling relations for coercive field (Ec) and remnant polarization (Pr) in the form of temperature have been proposed. The power law temperature exponents based on scaling were systematically established for the hysteresis parameters. The temperature dependent scaling of Ec and Pr at sintering temperature of 1480°C for 5 hr yields Ec α T−0.42, Ec α T−0.32, Ec α T−0.35 and Ec α T−0.34 and Pr α T−2.20, Pr α T−2.07,Pr α T−2.09 and Pr α T−2.12 respectively. Further, to analyze the domain dynamics, back switching polarization (Pbc) in terms of temperature (T) was also estimated by Arrhenius law and the average activation energy was evaluated. The maximum activation energy for domain switching is found to be 0.199 eV at 17 kV/cm for x = 0.6 sample.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":"30 1","pages":"101 - 112"},"PeriodicalIF":0.4,"publicationDate":"2017-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85126285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-02DOI: 10.1080/07315171.2017.1397445
R. K. Pan, Yang Li, W. Cao, Long H. Wang, Y. Qi, Lei Zhang, Xunzhong Shang
ABSTRACT Based on the Devonshire theory, a ratio of two thermodynamic parameters, a polarization – temperature coefficient, is found as the crucial for pyroelectric and dielectric tunability effects. Smaller ratio corresponds to larger degree of shift of dielectric peak and larger E-induced polarization. The materials will have higher temperature-stable dielectric tunability suitable for microwave devices. Larger ratio corresponds to larger change of electric hysteresis loop in shape and size with decreasing temperature from the Curie point. The materials will have larger pyroelectric coefficient. An experimental law that pyroelectric coefficient over square root of dielectric constant is a constant is derived.
{"title":"Effects of electric field induced polarization on dielectric tunability and pyroelectric coefficient","authors":"R. K. Pan, Yang Li, W. Cao, Long H. Wang, Y. Qi, Lei Zhang, Xunzhong Shang","doi":"10.1080/07315171.2017.1397445","DOIUrl":"https://doi.org/10.1080/07315171.2017.1397445","url":null,"abstract":"ABSTRACT Based on the Devonshire theory, a ratio of two thermodynamic parameters, a polarization – temperature coefficient, is found as the crucial for pyroelectric and dielectric tunability effects. Smaller ratio corresponds to larger degree of shift of dielectric peak and larger E-induced polarization. The materials will have higher temperature-stable dielectric tunability suitable for microwave devices. Larger ratio corresponds to larger change of electric hysteresis loop in shape and size with decreasing temperature from the Curie point. The materials will have larger pyroelectric coefficient. An experimental law that pyroelectric coefficient over square root of dielectric constant is a constant is derived.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":"86 1","pages":"81 - 92"},"PeriodicalIF":0.4,"publicationDate":"2017-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75916142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-02DOI: 10.1080/07315171.2017.1397446
Guang-ying Yang, Jianke Du, Ji Wang, Jia-shi Yang
ABSTRACT We studied electrically forced, transient thickness-extensional vibration of piezoelectric plates of crystals of class 6 mm as thin film bulk acoustic wave resonators. A generalized Fourier series solution was obtained and verified by comparison with finite element numerical analysis. The transient processes of the startup or shutting down of a resonator was examined. It was found that for a typical thin film resonator of ZnO or AlN with a 2 µm thickness, a fundamental thickness-extensional frequency of 1–2 GHz, and a damping described by a material quality factor of 105, the characteristic startup time from rest to time-harmonic motion is about 0.1 millisecond.
{"title":"Transient processes in thin film bulk acoustic wave piezoelectric resonators","authors":"Guang-ying Yang, Jianke Du, Ji Wang, Jia-shi Yang","doi":"10.1080/07315171.2017.1397446","DOIUrl":"https://doi.org/10.1080/07315171.2017.1397446","url":null,"abstract":"ABSTRACT We studied electrically forced, transient thickness-extensional vibration of piezoelectric plates of crystals of class 6 mm as thin film bulk acoustic wave resonators. A generalized Fourier series solution was obtained and verified by comparison with finite element numerical analysis. The transient processes of the startup or shutting down of a resonator was examined. It was found that for a typical thin film resonator of ZnO or AlN with a 2 µm thickness, a fundamental thickness-extensional frequency of 1–2 GHz, and a damping described by a material quality factor of 105, the characteristic startup time from rest to time-harmonic motion is about 0.1 millisecond.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":"45 1","pages":"100 - 93"},"PeriodicalIF":0.4,"publicationDate":"2017-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74478304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-02DOI: 10.1080/07315171.2017.1397447
S. Qu, W. Cao, Fan Fang, R. K. Pan, Y. Qi, Lei Zhang, Xunzhong Shang
ABSTRACT Reversible electrostrictive effect in ferroelectrics of double-well free energy is modeled using the Devonshire theory. The idea is developed that in tetrogonal phase 90° turnings of dipoles from four poling axises, isoenergetic minima, perpendicular to electrical field to the direction of electrical field cause electrostriction. Numerical simulation results exhibit that the exchanging coupling coefficient between dipoles results in a butterfly shaped electrostriction loop. Influences of temperature and the two parameters of materials on shape of electrostriction loop are discussed, and an empirical experimental law, about magnitude of electrostriction with the Curie constant, is confirmed.
{"title":"Research on electrostrictive effect of second-order phase transition ferroelectrics","authors":"S. Qu, W. Cao, Fan Fang, R. K. Pan, Y. Qi, Lei Zhang, Xunzhong Shang","doi":"10.1080/07315171.2017.1397447","DOIUrl":"https://doi.org/10.1080/07315171.2017.1397447","url":null,"abstract":"ABSTRACT Reversible electrostrictive effect in ferroelectrics of double-well free energy is modeled using the Devonshire theory. The idea is developed that in tetrogonal phase 90° turnings of dipoles from four poling axises, isoenergetic minima, perpendicular to electrical field to the direction of electrical field cause electrostriction. Numerical simulation results exhibit that the exchanging coupling coefficient between dipoles results in a butterfly shaped electrostriction loop. Influences of temperature and the two parameters of materials on shape of electrostriction loop are discussed, and an empirical experimental law, about magnitude of electrostriction with the Curie constant, is confirmed.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":"229 1","pages":"120 - 128"},"PeriodicalIF":0.4,"publicationDate":"2017-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75021225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-02DOI: 10.1080/07315171.2017.1397461
V. Topolov, A. Isaeva
ABSTRACT A piezoelectric performance of a novel 1–0–3 composite based on lead-free single crystals with 4mm symmetry is first analysed. Ferroelectric domain-engineered alkali niobate-tantalate based single crystals provide large values of the piezoelectric coefficients g*3j and g*h, squared figures of merit d*33 g*33 and d*h g*h, and a 0–3 matrix promotes a large piezoelectric anisotropy in specific volume-fraction ranges. An aspect-ratio effect concerned with spheroidal inclusions of a piezoelectric Li2B4O7 single crystal in a polymer medium is studied to show the considerable influence of these inclusions on the effective parameters of the composite. Values of g*33∼ 103 mV·m / N, g*h∼ (102–103) mV·m / N, d*33 g*33∼ 10−10 Pa−1, and d*h g*h∼ (10−11–10−10) Pa−1, and the large anisotropy of the piezoelectric coefficients d*3j and electromechanical coupling factors k*3j are achieved in the 1–0–3 composite based on a [001]-poled [Lix(K1-yNay)1-x](Nb1-zTaz)O3:Mn single crystal and make this composite suitable for piezoelectric sensor, energy-harvesting and hydroacoustic applications.
{"title":"High piezoelectric sensitivity and related parameters of a novel lead-free 1–0–3 composite","authors":"V. Topolov, A. Isaeva","doi":"10.1080/07315171.2017.1397461","DOIUrl":"https://doi.org/10.1080/07315171.2017.1397461","url":null,"abstract":"ABSTRACT A piezoelectric performance of a novel 1–0–3 composite based on lead-free single crystals with 4mm symmetry is first analysed. Ferroelectric domain-engineered alkali niobate-tantalate based single crystals provide large values of the piezoelectric coefficients g*3j and g*h, squared figures of merit d*33 g*33 and d*h g*h, and a 0–3 matrix promotes a large piezoelectric anisotropy in specific volume-fraction ranges. An aspect-ratio effect concerned with spheroidal inclusions of a piezoelectric Li2B4O7 single crystal in a polymer medium is studied to show the considerable influence of these inclusions on the effective parameters of the composite. Values of g*33∼ 103 mV·m / N, g*h∼ (102–103) mV·m / N, d*33 g*33∼ 10−10 Pa−1, and d*h g*h∼ (10−11–10−10) Pa−1, and the large anisotropy of the piezoelectric coefficients d*3j and electromechanical coupling factors k*3j are achieved in the 1–0–3 composite based on a [001]-poled [Lix(K1-yNay)1-x](Nb1-zTaz)O3:Mn single crystal and make this composite suitable for piezoelectric sensor, energy-harvesting and hydroacoustic applications.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":"5 1","pages":"73 - 80"},"PeriodicalIF":0.4,"publicationDate":"2017-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86739977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-05-04DOI: 10.1080/07315171.2017.1320491
J. Koo, K. Lee
ABSTRACT Considering a photon field from its constituent electrons and ions, a photon correlation theory for ferroelectrics and antiferromagnetism is proposed. We calculate the spontaneous polarization which originates from a certain alignments of photon field in correlation with the specific phonon mode. Using the microscopic Hamiltonian we obtain the ferroelectric transition temperature, Tc and the antiferromagnetic transition temperature, TN in multiferroic materials. Tc and TN are given by same formula except different wavevector dependence originated from geometric difference between ferroelectrics and antiferromagnetism in multiferroics. The correlation between magnetic field and electric field on ferroelectrics and antiferromagnetism is considered to obtain the spontaneous polarization in good correspondence with experimental data.
{"title":"Ferroelectricity and antiferromagnetism in multiferroic materials explained by photonic tunneling model","authors":"J. Koo, K. Lee","doi":"10.1080/07315171.2017.1320491","DOIUrl":"https://doi.org/10.1080/07315171.2017.1320491","url":null,"abstract":"ABSTRACT Considering a photon field from its constituent electrons and ions, a photon correlation theory for ferroelectrics and antiferromagnetism is proposed. We calculate the spontaneous polarization which originates from a certain alignments of photon field in correlation with the specific phonon mode. Using the microscopic Hamiltonian we obtain the ferroelectric transition temperature, Tc and the antiferromagnetic transition temperature, TN in multiferroic materials. Tc and TN are given by same formula except different wavevector dependence originated from geometric difference between ferroelectrics and antiferromagnetism in multiferroics. The correlation between magnetic field and electric field on ferroelectrics and antiferromagnetism is considered to obtain the spontaneous polarization in good correspondence with experimental data.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":"110 1","pages":"42 - 48"},"PeriodicalIF":0.4,"publicationDate":"2017-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78782145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-05-04DOI: 10.1080/07315171.2017.1319749
R. V. Williama, A. Marikania, D. Madhavanb, George W. Taylor
ABSTRACT Multiferroic materials such as BiCrO3, uniquely exhibit ferroelectricity and ferromagnetism simultaneously have been extensively studied for spintronics device applications. Conversely, the origin of multiferroicity remains poorly understood. In this paper, the structural phases of BiCrO3 over Pt (111)/Ti/SiO2/Si substrate and their lattice distortions after careful annealing were carefully investigated to explain their multiferroicity. Structural transition and different phases was studied from X-ray diffraction at different annealing temperature from 400°C to 700°C and the size of the grains were calculated from Scherrer's equation. SEM and AFM reveal nano-rod formation and the size and density of nano-rods tends to increase with increase of temperature. The step height variation and surface outgrowth of the films at different annealing temperature were further studied by measuring root mean square (RMS) and roughness (Rq) values. The frequency dependent dielectric behavior with terrific dielectric constant and dielectric loss were observed using LCRQ meter. Structural transformation also results an improved (well saturated) ferromagnetism at 700°C from weak ferromagnetism at 400°C due to addition of extra phases. This kind of approach could be used to probe the origin of multiferroic properties in rare-earth materials for device applications.
{"title":"Effect of annealing process on dielectric and multiferroic properties of Sol-Gel derived bismuth chromate thin films","authors":"R. V. Williama, A. Marikania, D. Madhavanb, George W. Taylor","doi":"10.1080/07315171.2017.1319749","DOIUrl":"https://doi.org/10.1080/07315171.2017.1319749","url":null,"abstract":"ABSTRACT Multiferroic materials such as BiCrO3, uniquely exhibit ferroelectricity and ferromagnetism simultaneously have been extensively studied for spintronics device applications. Conversely, the origin of multiferroicity remains poorly understood. In this paper, the structural phases of BiCrO3 over Pt (111)/Ti/SiO2/Si substrate and their lattice distortions after careful annealing were carefully investigated to explain their multiferroicity. Structural transition and different phases was studied from X-ray diffraction at different annealing temperature from 400°C to 700°C and the size of the grains were calculated from Scherrer's equation. SEM and AFM reveal nano-rod formation and the size and density of nano-rods tends to increase with increase of temperature. The step height variation and surface outgrowth of the films at different annealing temperature were further studied by measuring root mean square (RMS) and roughness (Rq) values. The frequency dependent dielectric behavior with terrific dielectric constant and dielectric loss were observed using LCRQ meter. Structural transformation also results an improved (well saturated) ferromagnetism at 700°C from weak ferromagnetism at 400°C due to addition of extra phases. This kind of approach could be used to probe the origin of multiferroic properties in rare-earth materials for device applications.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":"25 1","pages":"18 - 28"},"PeriodicalIF":0.4,"publicationDate":"2017-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74302961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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