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Effect of Fe/Ta doping on structural, dielectric, and electrical properties of Bi 4 Ti 2.5 Fe 0.25 Ta 0.25 O 12 ceramics
Author(s) -
Rehman Fida,
Wang Lin,
Jin HaiBo,
Bukhtiar Arfan,
Zhang Ruibo,
Zhao Yongjie,
Li JingBo
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14577
Subject(s) - aurivillius , materials science , dielectric , rietveld refinement , ferroelectricity , ceramic , analytical chemistry (journal) , dielectric spectroscopy , phase transition , doping , atmospheric temperature range , phase (matter) , ferroelectric ceramics , crystallography , crystal structure , condensed matter physics , chemistry , electrochemistry , thermodynamics , optoelectronics , metallurgy , electrode , physics , organic chemistry , chromatography
Abstract Aurivillius single‐phase Bi 4 Ti 2.5 Fe 0.25 Ta 0.25 O 12 ceramics was prepared via high‐temperature solid‐state reaction method. The detailed structural analysis of the doped Bi 4 Ti 3 O 12 compound was carried out by Rietveld refinement of the full XRD Pattern. Dielectric and electrical properties were studied in a wide range of temperature and frequency by dielectric/impedance spectroscopies. The comprehensive analysis of frequency spectrum reveals the occurrence of two relaxation behaviors in the ceramics at low frequency and high frequency, respectively. A phase transition was observed at ~650°C in Bi 4 Ti 2.5 Fe 0.25 Ta 0.25 O 12 somewhat lower than the ferroelectric transition temperature of Bi 4 Ti 3 O 12 . The possible reason for the decrease of ferroelectric transition temperature was discussed based on the structural analysis. The present results could be useful for designing and/or modifying properties of Bi 4 Ti 3 O 12 ‐related ceramics.