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Published in: Journal of Materials Science 12/2017

13-03-2017 | Original Paper

Magnetic, dielectric, and magnetodielectric properties of Bi-layered perovskite Bi4.25Gd 0.75Fe0.5Co0.5Ti3O15

Authors: Yuying Wu, Tianshu Yao, Yuxi Lu, Baowen Zou, Xiangyu Mao, Fengzhen Huang, Hui Sun, Xiaobing Chen

Published in: Journal of Materials Science | Issue 12/2017

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Abstract

The magnetic, dielectric, and magnetodielectric properties of bi-layered perovskite Bi4.25Gd0.75Fe0.5Co0.5Ti3O15 (BGFCT) ceramics were investigated. Weak ferromagnetism at room temperature with a remnant magnetization M r of 0.26 emu/g was found in the BGFCT specimens, and the ferromagnetic transition was determined at ~383 K. The change in valence state for magnetic ions has been confirmed by the XPS measurement, which would introduce ferromagnetism via double-exchange interaction. The Dzyaloshinsky–Moriya interaction was also proposed to explain weak ferromagnetism. The ferroelectric phase transition around 1072 K has been verified by the temperature-dependent dielectric measurement and differential scanning calorimetry. The standard positive-up–negative-down tests indicated the intrinsic ferroelectricity of BGFCT, and an obvious MD effect was observed in the temperature range from 190 to 280 K. The dielectric loss of the BGFCT exhibits one dielectric relaxation with activation energy E a ~ 0.49 eV, which is related to the hooping of oxygen vacancies.

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Metadata
Title
Magnetic, dielectric, and magnetodielectric properties of Bi-layered perovskite Bi4.25Gd 0.75Fe0.5Co0.5Ti3O15
Authors
Yuying Wu
Tianshu Yao
Yuxi Lu
Baowen Zou
Xiangyu Mao
Fengzhen Huang
Hui Sun
Xiaobing Chen
Publication date
13-03-2017
Publisher
Springer US
Published in
Journal of Materials Science / Issue 12/2017
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-017-0971-3

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