Structure and local structure investigation of (0.85-x)BaTiO3-0.15BiFeO3-xKVO3 system linked to electrical properties
In this work, the composition of (0.85-x)BaTiO3–0.15BiFeO3–xKVO3 (TFVx) was investigated. The sintered sample behaves tetragonal perovskite ABO3 structure, defects, and a trace secondary phase of Ba3(VO4). The X-ray Absorption Near Edge Spectroscopy (XANES) analysis on the Fe K-edge TFVx sample dete...
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Published in: | Materials chemistry and physics 2022-01, Vol.276, p.125414, Article 125414 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | In this work, the composition of (0.85-x)BaTiO3–0.15BiFeO3–xKVO3 (TFVx) was investigated. The sintered sample behaves tetragonal perovskite ABO3 structure, defects, and a trace secondary phase of Ba3(VO4). The X-ray Absorption Near Edge Spectroscopy (XANES) analysis on the Fe K-edge TFVx sample determined the oxidation state of Fe, it is a mixture of 3+ and 4+, while the Extended X-Ray Absorption Fine Structure (EXAFS) revealed a local distortion of octahedron BO6. The Arrhenius plot of the ln σ vs. 1/T showing n-type semiconductor, the conductivity behavior indicates it presents the small polaron hopping, Schottky defect, and oxygen vacancy VO••that contribute to the conductivity. The relative permittivity (εr) displays two maxima related to Curie temperature of the matrix BaTiO3 and the defective lattice producing diffuse transition that intervene permittivity. Increasing the frequency causes the peak permittivity and the dielectric loss (tanδ) shift towards higher temperatures. These findings suggest the sample delivering relaxor behavior.
•The solid solution of (Ba(0.85-x)Bi0.15Kx) (Ti(0.85-x)Fe0.15Vx)O3-δ was synthesized and investigated.•The local and defect structure was investigated through XAS.•The conductivity includes small polaron, Schottky defect and oxygen vacancy VO••.•The relaxor behavior related to defects lead to the formation of polar nanoregions (PNRs). |
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ISSN: | 0254-0584 1879-3312 |
DOI: | 10.1016/j.matchemphys.2021.125414 |