Pub Date : 2023-06-06DOI: 10.1080/01411594.2023.2218005
R. Raman, G. Venkatesan, P. Sakthivel, I. B. Shameem Banu
ABSTRACT Recently, multiferroic materials such as BiFeO3 have fascinated researchers for their potential application in memory storage devices. However, high leakage, weak magnetism and magnetoelectric coupling in this system restrict its practical applications. To solve this, the octahedra tilt influencing electrical, magnetic and thermal properties of polycrystalline Bi0.9Co0.1FeO3 ceramics via solid state route is studied here. Cobalt doped BiFeO3 affect the structural arrangement and tunes the crystal engineering of BiFeO3. In particular, the temperature-dependent dielectric behaviour of Bi0.9Co0.1FeO3 shows a significant dielectric anomaly corresponding to the magnetoelectric coupling in this sample. Further, the maximum magnetization of Bi0.9Co0.1FeO3 is 8.70 emu/ g which is two orders higher in magnitude compared to pristine BiFeO3.
{"title":"Octahedra tilt influencing physical properties of polycrystalline Bi0.9Co0.1FeO3 ceramics","authors":"R. Raman, G. Venkatesan, P. Sakthivel, I. B. Shameem Banu","doi":"10.1080/01411594.2023.2218005","DOIUrl":"https://doi.org/10.1080/01411594.2023.2218005","url":null,"abstract":"ABSTRACT\u0000 Recently, multiferroic materials such as BiFeO3 have fascinated researchers for their potential application in memory storage devices. However, high leakage, weak magnetism and magnetoelectric coupling in this system restrict its practical applications. To solve this, the octahedra tilt influencing electrical, magnetic and thermal properties of polycrystalline Bi0.9Co0.1FeO3 ceramics via solid state route is studied here. Cobalt doped BiFeO3 affect the structural arrangement and tunes the crystal engineering of BiFeO3. In particular, the temperature-dependent dielectric behaviour of Bi0.9Co0.1FeO3 shows a significant dielectric anomaly corresponding to the magnetoelectric coupling in this sample. Further, the maximum magnetization of Bi0.9Co0.1FeO3 is 8.70 emu/ g which is two orders higher in magnitude compared to pristine BiFeO3.","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"96 1","pages":"496 - 513"},"PeriodicalIF":1.6,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45265285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-03DOI: 10.1080/01411594.2023.2214666
Surbhi Chalotra, Simranpreet Kaur, Kriti, P. Kaur, P. Kaur, Parminder Kaur, D. Singh
ABSTRACT Pure and Ti-doped WO3 nano systems synthesized by the solid state reaction method and annealed at different temperatures, were studied for changes in structural, optical and magnetic properties. X-ray diffraction, Raman, UV–Vis, photoluminescence spectroscopy, vibrating sample magnetometer (VSM) techniques were employed for structural, optical and magnetic characterization to study the modification of the electronic structure and disorder developed in the samples. Inclusion of Ti ions leads to degradation in the crystallinity of the monoclinic single phase system with an increase in the content of the dopant ions, whereas increased annealing temperature enhances crystallinity. A red shift in the optical band gap indicates the production of defect states. As the annealing temperature is raised, the amount of visible photoluminescence (PL) emissions caused by oxygen vacancies decreases. Magnetic experiments demonstrate the ferromagnetic properties of the prepared samples, which exhibit a decrease with Ti doping and an increase in annealing temperature.
{"title":"Impact of Ti doping and annealing temperature on structural and opto-magnetic properties of tungsten oxide (WO3)","authors":"Surbhi Chalotra, Simranpreet Kaur, Kriti, P. Kaur, P. Kaur, Parminder Kaur, D. Singh","doi":"10.1080/01411594.2023.2214666","DOIUrl":"https://doi.org/10.1080/01411594.2023.2214666","url":null,"abstract":"ABSTRACT Pure and Ti-doped WO3 nano systems synthesized by the solid state reaction method and annealed at different temperatures, were studied for changes in structural, optical and magnetic properties. X-ray diffraction, Raman, UV–Vis, photoluminescence spectroscopy, vibrating sample magnetometer (VSM) techniques were employed for structural, optical and magnetic characterization to study the modification of the electronic structure and disorder developed in the samples. Inclusion of Ti ions leads to degradation in the crystallinity of the monoclinic single phase system with an increase in the content of the dopant ions, whereas increased annealing temperature enhances crystallinity. A red shift in the optical band gap indicates the production of defect states. As the annealing temperature is raised, the amount of visible photoluminescence (PL) emissions caused by oxygen vacancies decreases. Magnetic experiments demonstrate the ferromagnetic properties of the prepared samples, which exhibit a decrease with Ti doping and an increase in annealing temperature.","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"96 1","pages":"528 - 546"},"PeriodicalIF":1.6,"publicationDate":"2023-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45169991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-03DOI: 10.1080/01411594.2023.2218004
Md Sahanoor Islam, J. Ghosh
ABSTRACT BaTiO3-based materials are used as the replacement for lead-based perovskite materials for its wide dielectric applications. But the substitution of different doping elements in pure BaTiO3 drastically affects the microstructure, phase transition behavior and electrical properties. In the present work, local structure, phase transformation and dielectric behavior of BaCexTi1-xO3 (BCT) ceramics were studied for compositions x = 0.02, 0.05 and 0.1. A diffuse phase transition from orthorhombic to cubic via tetragonal in BCT with increasing Ce content was observed. An increase in particle size with Ce doping concentration was observed in FESEM images. Spherical and cuboid-shaped particle in the order of 80–150 nm was observed in transmission electron microscopic (TEM) images. RAMAN spectra confirm the tetragonal to cubic phase transition. Local structural and phase transformation behavior was obtained from laboratory-based PDF and XRD, respectively. Change in PDF was observed due to an increase in Ce doping. Dielectric properties decreased for Ce mole fraction of x = 0.1.
{"title":"Investigation of local structure and phase transformation in Ce-doped barium titanate and correlation with electrical properties","authors":"Md Sahanoor Islam, J. Ghosh","doi":"10.1080/01411594.2023.2218004","DOIUrl":"https://doi.org/10.1080/01411594.2023.2218004","url":null,"abstract":"ABSTRACT BaTiO3-based materials are used as the replacement for lead-based perovskite materials for its wide dielectric applications. But the substitution of different doping elements in pure BaTiO3 drastically affects the microstructure, phase transition behavior and electrical properties. In the present work, local structure, phase transformation and dielectric behavior of BaCexTi1-xO3 (BCT) ceramics were studied for compositions x = 0.02, 0.05 and 0.1. A diffuse phase transition from orthorhombic to cubic via tetragonal in BCT with increasing Ce content was observed. An increase in particle size with Ce doping concentration was observed in FESEM images. Spherical and cuboid-shaped particle in the order of 80–150 nm was observed in transmission electron microscopic (TEM) images. RAMAN spectra confirm the tetragonal to cubic phase transition. Local structural and phase transformation behavior was obtained from laboratory-based PDF and XRD, respectively. Change in PDF was observed due to an increase in Ce doping. Dielectric properties decreased for Ce mole fraction of x = 0.1.","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"96 1","pages":"471 - 481"},"PeriodicalIF":1.6,"publicationDate":"2023-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44132349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-24DOI: 10.1080/01411594.2023.2214665
R. Meher, Rajib Padhee, Sunena Parida
ABSTRACT In this communication, the synthesis (solid-state reaction) and characterization (structural, dielectric, and transport) of the CaMn0.9Ce0.1O3 ceramic (named, CMCO) are discussed. The CMCO has an orthorhombic crystal symmetry with an average crystallite size of 108.7 nm and lattice strain of 0.00375 respectively. The grains are distributed uniformly in a very compact manner so that highly dense material is formed and the ratio of average grain size to average crystallite size is about 21, which may be a possible reason for a better dielectric and conductivity mechanism. Raman's study confirms the presence of all constituent elements. The analysis of the dielectric properties suggests the presence of the Maxwell-Wagner type of dispersion. The study of impedance spectroscopy reveals how grains and grain boundaries play an important role to define conductivity mechanism and hence prove a non-Debye type of relaxation. The analysis of the resistance versus temperature plots supports NTC thermistor character.
{"title":"Cerium-modified single perovskite CaMnO3: structural, dielectric, and transport properties","authors":"R. Meher, Rajib Padhee, Sunena Parida","doi":"10.1080/01411594.2023.2214665","DOIUrl":"https://doi.org/10.1080/01411594.2023.2214665","url":null,"abstract":"ABSTRACT In this communication, the synthesis (solid-state reaction) and characterization (structural, dielectric, and transport) of the CaMn0.9Ce0.1O3 ceramic (named, CMCO) are discussed. The CMCO has an orthorhombic crystal symmetry with an average crystallite size of 108.7 nm and lattice strain of 0.00375 respectively. The grains are distributed uniformly in a very compact manner so that highly dense material is formed and the ratio of average grain size to average crystallite size is about 21, which may be a possible reason for a better dielectric and conductivity mechanism. Raman's study confirms the presence of all constituent elements. The analysis of the dielectric properties suggests the presence of the Maxwell-Wagner type of dispersion. The study of impedance spectroscopy reveals how grains and grain boundaries play an important role to define conductivity mechanism and hence prove a non-Debye type of relaxation. The analysis of the resistance versus temperature plots supports NTC thermistor character.","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"96 1","pages":"482 - 495"},"PeriodicalIF":1.6,"publicationDate":"2023-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45662817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-19DOI: 10.1080/01411594.2023.2212104
S. Różański
{"title":"Effect of surface treatment on the dynamics of relaxation processes in confinement: ferroelectric liquid crystal in porous Anopore membrane","authors":"S. Różański","doi":"10.1080/01411594.2023.2212104","DOIUrl":"https://doi.org/10.1080/01411594.2023.2212104","url":null,"abstract":"","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47981432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-12DOI: 10.1080/01411594.2023.2209258
S. Ghosh, Joydeep Chowdhury
ABSTRACT The paper is aimed to understand the key phonon modes that are responsible for the temperature dependent structural phase transition and negative thermal expansion of Hg2Cl2 compound for the first time with the aid of density functional theory and Born-Oppenheimer on the fly molecular dynamics calculations. The phonon dispersion spectra, phonon density of states and Grüneisen parameters for the body-centered tetragonal and base-centered orthorhombic phases of the compound have been explored in detail. The order parameter associated with the phase transition and its nature has also been reported herewith. We believe that the present study will not only help for futuristic designs of improved functionalized systems with Hg2Cl2 compound but also can augment their applications in thermoelectric conversion systems, fibre-optic communications, thermal expansion compensators and in fuel cells.
{"title":"Temperature dependent phase transition and negative thermal expansion of Hg2Cl2 compound: insights from first-principle DFT and Born-Oppenheimer on the fly molecular dynamics calculations","authors":"S. Ghosh, Joydeep Chowdhury","doi":"10.1080/01411594.2023.2209258","DOIUrl":"https://doi.org/10.1080/01411594.2023.2209258","url":null,"abstract":"ABSTRACT The paper is aimed to understand the key phonon modes that are responsible for the temperature dependent structural phase transition and negative thermal expansion of Hg2Cl2 compound for the first time with the aid of density functional theory and Born-Oppenheimer on the fly molecular dynamics calculations. The phonon dispersion spectra, phonon density of states and Grüneisen parameters for the body-centered tetragonal and base-centered orthorhombic phases of the compound have been explored in detail. The order parameter associated with the phase transition and its nature has also been reported herewith. We believe that the present study will not only help for futuristic designs of improved functionalized systems with Hg2Cl2 compound but also can augment their applications in thermoelectric conversion systems, fibre-optic communications, thermal expansion compensators and in fuel cells.","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"96 1","pages":"446 - 463"},"PeriodicalIF":1.6,"publicationDate":"2023-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48527872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-06DOI: 10.1080/01411594.2023.2206028
Layla Farhat, M. Bardoux, S. Longuemart, B. Duponchel, Ziad Herro, A. Hadj Sahraoui
{"title":"Measurement of the dynamic temperature response of electrocaloric effect in solid ferroelectric materials via thermoreflectance","authors":"Layla Farhat, M. Bardoux, S. Longuemart, B. Duponchel, Ziad Herro, A. Hadj Sahraoui","doi":"10.1080/01411594.2023.2206028","DOIUrl":"https://doi.org/10.1080/01411594.2023.2206028","url":null,"abstract":"","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49259018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-04DOI: 10.1080/01411594.2023.2205591
T. S. Thejas, B. Sahoo, P. Panda
ABSTRACT Ba(Zr0.02Ti0.98)O3 (BZT) samples with various weight percentages of Sm2O3 (0.02–0.06) were synthesized and calcined at 1100°C for 4 h. Circular pellets were prepared using calcined powders and sintered at 1450°C for 2 h. The sintered and poled samples were used for the measurement of various electrical properties. Maximum piezoelectric charge constant (d 33) of 372 pC/N obtained for 0.02 wt.% Sm2O3-doped BZT. Dielectric constant (K = 15,855) at 100 Hz was found maximum for this composition at Curie temperature (T c) of 125°C. Scanning electron microscopy (SEM) study revealed a decrease in grain size with an increase in Sm2O3 content. Largely, a lower concentration of Sm2O3-doped BZT compositions with higher d 33 could be suitable for vibration sensor and accelerometer applications.
{"title":"A study on Sm2O3-doped Ba(Zr0.02Ti0.98)O3 ceramics for sensor applications","authors":"T. S. Thejas, B. Sahoo, P. Panda","doi":"10.1080/01411594.2023.2205591","DOIUrl":"https://doi.org/10.1080/01411594.2023.2205591","url":null,"abstract":"ABSTRACT Ba(Zr0.02Ti0.98)O3 (BZT) samples with various weight percentages of Sm2O3 (0.02–0.06) were synthesized and calcined at 1100°C for 4 h. Circular pellets were prepared using calcined powders and sintered at 1450°C for 2 h. The sintered and poled samples were used for the measurement of various electrical properties. Maximum piezoelectric charge constant (d 33) of 372 pC/N obtained for 0.02 wt.% Sm2O3-doped BZT. Dielectric constant (K = 15,855) at 100 Hz was found maximum for this composition at Curie temperature (T c) of 125°C. Scanning electron microscopy (SEM) study revealed a decrease in grain size with an increase in Sm2O3 content. Largely, a lower concentration of Sm2O3-doped BZT compositions with higher d 33 could be suitable for vibration sensor and accelerometer applications.","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"96 1","pages":"434 - 445"},"PeriodicalIF":1.6,"publicationDate":"2023-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41742145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-28DOI: 10.1080/01411594.2023.2203395
H. Yurtseven, E. Kilit Dogan
ABSTRACT The smectic-hexatic phase transitions are studied by the Landau mean field theory in binary mixtures, particularly, THI-14 + MPR-6 liquid crystalline system. By considering the phase lines of SmA-Hex B, SmC-SmF (Hex F) and SmF-Hex B as the first order; SmA-SmC and SmC-SmF as the second order, in the presence of the two tricritical points (C-F-B and A-C-B), we calculate the T-X phase diagram of the binary mixture studied. The phase line equations obtained from the free energies of the smectic and hexatic phases, are fitted to the experimental data given in the literature. We find that the Landau mean field theory explains satisfactorily the observed T-X phase diagram for the smectic-hexatic transitions in the binary mixture of THI-14 + MPR-6.
{"title":"Tricritical behavior of the smectic-hexatic phase transitions in binary mixtures using the landau mean field theory","authors":"H. Yurtseven, E. Kilit Dogan","doi":"10.1080/01411594.2023.2203395","DOIUrl":"https://doi.org/10.1080/01411594.2023.2203395","url":null,"abstract":"ABSTRACT\u0000 The smectic-hexatic phase transitions are studied by the Landau mean field theory in binary mixtures, particularly, THI-14 + MPR-6 liquid crystalline system. By considering the phase lines of SmA-Hex B, SmC-SmF (Hex F) and SmF-Hex B as the first order; SmA-SmC and SmC-SmF as the second order, in the presence of the two tricritical points (C-F-B and A-C-B), we calculate the T-X phase diagram of the binary mixture studied. The phase line equations obtained from the free energies of the smectic and hexatic phases, are fitted to the experimental data given in the literature. We find that the Landau mean field theory explains satisfactorily the observed T-X phase diagram for the smectic-hexatic transitions in the binary mixture of THI-14 + MPR-6.","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"96 1","pages":"383 - 399"},"PeriodicalIF":1.6,"publicationDate":"2023-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47687661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-28DOI: 10.1080/01411594.2023.2203394
M. A. Hamad, H. Alamri, S. M. Elghnam, S. Badawy
ABSTRACT To simulate the magnetocaloric effect (MCE) of a HoCo2 sample, a phenomenological model (PM) is used. MCE parameters are inferred from PM as the result of modelling for magnetization vs. temperature in 0.5 T. The HoCo2 exhibits two consecutive conventional MCEs with cooling via adiabatic demagnetization. HoCo2 exhibits double peak MCE behaviour. It is recommended that HoCo2 use it as a useful MR material over a temperature range spanning a significant temperature range of 0–140 K. Consequently, HoCo2 is appealing for MR because its MCE spans a wide temperature range, particularly liquefaction of nitrogen and hydrogen.
{"title":"Detection of two magnetocaloric consecutive peaks in HoCo2","authors":"M. A. Hamad, H. Alamri, S. M. Elghnam, S. Badawy","doi":"10.1080/01411594.2023.2203394","DOIUrl":"https://doi.org/10.1080/01411594.2023.2203394","url":null,"abstract":"ABSTRACT To simulate the magnetocaloric effect (MCE) of a HoCo2 sample, a phenomenological model (PM) is used. MCE parameters are inferred from PM as the result of modelling for magnetization vs. temperature in 0.5 T. The HoCo2 exhibits two consecutive conventional MCEs with cooling via adiabatic demagnetization. HoCo2 exhibits double peak MCE behaviour. It is recommended that HoCo2 use it as a useful MR material over a temperature range spanning a significant temperature range of 0–140 K. Consequently, HoCo2 is appealing for MR because its MCE spans a wide temperature range, particularly liquefaction of nitrogen and hydrogen.","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"96 1","pages":"464 - 469"},"PeriodicalIF":1.6,"publicationDate":"2023-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47831418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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