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AC conductivity and phase transition of the BST–BFO ceramic doped with Yb
The homogeneity of the 0.8(Ba(0.8)Sr(0.2))TiO(3)–0.2(Bi(0.85)Yb(0.15))FeO(3) ceramic, prepared by a solid-state process, was studied and quantitatively analyzed by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). At ambient temperature, X-ray diffraction shows the e...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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The Royal Society of Chemistry
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9511099/ https://www.ncbi.nlm.nih.gov/pubmed/36276054 http://dx.doi.org/10.1039/d2ra03371b |
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author | Ben Abdessalem, M. Chkoundali, S. Oueslati, A. Aydi, A. |
author_facet | Ben Abdessalem, M. Chkoundali, S. Oueslati, A. Aydi, A. |
author_sort | Ben Abdessalem, M. |
collection | PubMed |
description | The homogeneity of the 0.8(Ba(0.8)Sr(0.2))TiO(3)–0.2(Bi(0.85)Yb(0.15))FeO(3) ceramic, prepared by a solid-state process, was studied and quantitatively analyzed by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). At ambient temperature, X-ray diffraction shows the existence of only one perovskite phase in the tetragonal structure with the space group P4mm. The thermal variations of [Image: see text] (real part of the dielectric permittivity) for this composition show extended peaks with temperature; this broadening of the peaks can be attributed to the diffuse character of the transition. As the frequency increases, T(m) (temperature of maximum permittivity) moves at higher temperatures, and the maximum values of [Image: see text] decrease. Moreover, the impedance spectra (−Z′′ vs. Z′) show the presence of two arcs of circles that have been modeled with an equivalent electrical circuit. The arcs of the circles centered under the real axis (Z) prove the Cole–Cole-type behavior. Each circle is associated with either the grain effect or grain boundaries. Electrical modulus analysis shows that the capacitance of the ceramic is enhanced, which is in good agreement with the results of complex impedance analysis. The AC conductivity complies with the universal power law. It disputes the modification of AC conductivity by adopting the Arrhenius-type of electrical conductivity. The temperature dependence of alternating current conductivity (σ(g)) and direct current conductivity (σ(DC)) confirms the existence of the ferroelectric–paraelectric phase transition. |
format | Online Article Text |
id | pubmed-9511099 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-95110992022-10-21 AC conductivity and phase transition of the BST–BFO ceramic doped with Yb Ben Abdessalem, M. Chkoundali, S. Oueslati, A. Aydi, A. RSC Adv Chemistry The homogeneity of the 0.8(Ba(0.8)Sr(0.2))TiO(3)–0.2(Bi(0.85)Yb(0.15))FeO(3) ceramic, prepared by a solid-state process, was studied and quantitatively analyzed by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). At ambient temperature, X-ray diffraction shows the existence of only one perovskite phase in the tetragonal structure with the space group P4mm. The thermal variations of [Image: see text] (real part of the dielectric permittivity) for this composition show extended peaks with temperature; this broadening of the peaks can be attributed to the diffuse character of the transition. As the frequency increases, T(m) (temperature of maximum permittivity) moves at higher temperatures, and the maximum values of [Image: see text] decrease. Moreover, the impedance spectra (−Z′′ vs. Z′) show the presence of two arcs of circles that have been modeled with an equivalent electrical circuit. The arcs of the circles centered under the real axis (Z) prove the Cole–Cole-type behavior. Each circle is associated with either the grain effect or grain boundaries. Electrical modulus analysis shows that the capacitance of the ceramic is enhanced, which is in good agreement with the results of complex impedance analysis. The AC conductivity complies with the universal power law. It disputes the modification of AC conductivity by adopting the Arrhenius-type of electrical conductivity. The temperature dependence of alternating current conductivity (σ(g)) and direct current conductivity (σ(DC)) confirms the existence of the ferroelectric–paraelectric phase transition. The Royal Society of Chemistry 2022-09-26 /pmc/articles/PMC9511099/ /pubmed/36276054 http://dx.doi.org/10.1039/d2ra03371b Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/ |
spellingShingle | Chemistry Ben Abdessalem, M. Chkoundali, S. Oueslati, A. Aydi, A. AC conductivity and phase transition of the BST–BFO ceramic doped with Yb |
title | AC conductivity and phase transition of the BST–BFO ceramic doped with Yb |
title_full | AC conductivity and phase transition of the BST–BFO ceramic doped with Yb |
title_fullStr | AC conductivity and phase transition of the BST–BFO ceramic doped with Yb |
title_full_unstemmed | AC conductivity and phase transition of the BST–BFO ceramic doped with Yb |
title_short | AC conductivity and phase transition of the BST–BFO ceramic doped with Yb |
title_sort | ac conductivity and phase transition of the bst–bfo ceramic doped with yb |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9511099/ https://www.ncbi.nlm.nih.gov/pubmed/36276054 http://dx.doi.org/10.1039/d2ra03371b |
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