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Role of (Bi1/2K1/2)TiO3 in the dielectric relaxations of BiFeO3-(Bi1/2K1/2)TiO3 ceramics

Cheon, Chae II and Choi, Jin Hong and Kim, Jeong Seog and Zang, Jiadong and Frömling, Till and Rödel, Jürgen and Jo, Wook (2016):
Role of (Bi1/2K1/2)TiO3 in the dielectric relaxations of BiFeO3-(Bi1/2K1/2)TiO3 ceramics.
In: Journal of Applied Physics, 119, (15), ISSN 0021-8979,
[Online-Edition: http://dx.doi.org/10.1063/1.4946844],
[Article]

Abstract

Temperature-dependent dielectric relaxations of (1-x)BiFeO3-x(Bi1/2K1/2)TiO3 (BF-BKT) lead-free piezoceramics (0.4<x<0.8) were investigated via impedance spectroscopic techniques. Regardless of the compositions, the dielectric maximum temperatures exhibit a frequency-dependent dispersion,originating from a Debye relaxation due to the presence of oxygen vacancies. It was also observed that there exist local dielectric maxima due to the relaxation of polar nanoregions as a shoulder on the lower temperature side. The onset temperature for the Debye-type relaxation decreased with decreasing BKT content, gradually overlapping with the low-temperature dielectric dispersion from the relaxation of polar nanoregions. It is proposed that the role of BKT in the BF-BKT system is toenhance the random fields that favor a relaxor state and to suppress the Debye-type relaxation of oxygen vacancy related dipoles. Published by AIP Publishing.

Item Type: Article
Erschienen: 2016
Creators: Cheon, Chae II and Choi, Jin Hong and Kim, Jeong Seog and Zang, Jiadong and Frömling, Till and Rödel, Jürgen and Jo, Wook
Title: Role of (Bi1/2K1/2)TiO3 in the dielectric relaxations of BiFeO3-(Bi1/2K1/2)TiO3 ceramics
Language: English
Abstract:

Temperature-dependent dielectric relaxations of (1-x)BiFeO3-x(Bi1/2K1/2)TiO3 (BF-BKT) lead-free piezoceramics (0.4<x<0.8) were investigated via impedance spectroscopic techniques. Regardless of the compositions, the dielectric maximum temperatures exhibit a frequency-dependent dispersion,originating from a Debye relaxation due to the presence of oxygen vacancies. It was also observed that there exist local dielectric maxima due to the relaxation of polar nanoregions as a shoulder on the lower temperature side. The onset temperature for the Debye-type relaxation decreased with decreasing BKT content, gradually overlapping with the low-temperature dielectric dispersion from the relaxation of polar nanoregions. It is proposed that the role of BKT in the BF-BKT system is toenhance the random fields that favor a relaxor state and to suppress the Debye-type relaxation of oxygen vacancy related dipoles. Published by AIP Publishing.

Journal or Publication Title: Journal of Applied Physics
Volume: 119
Number: 15
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Date Deposited: 22 Apr 2016 06:17
Official URL: http://dx.doi.org/10.1063/1.4946844
Identification Number: doi:10.1063/1.4946844
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