期刊
JOURNAL OF APPLIED PHYSICS
卷 119, 期 15, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4946844
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资金
- National Research Foundation of Korea - Korean Government [NRF-2012S1A2A1A01031845]
- National Research Foundation of Korea [2012S1A2A1A01031845] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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 to enhance the random fields that favor a relaxor state and to suppress the Debye-type relaxation of oxygen vacancy related dipoles. Published by AIP Publishing.
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