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Suppressed ferroelectric relaxor behavior of Mn‐modified Ba( Z r 0.3 T i 0.7 ) O 3 relaxor ceramics
Author(s) -
Zhang Qiwei,
Zhai Jiwei,
Li Hongqiang,
Yue Zhenxing,
Kong Ling Bing
Publication year - 2014
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201330269
Subject(s) - materials science , ferroelectricity , dielectric , ceramic , annealing (glass) , analytical chemistry (journal) , relaxor ferroelectric , doping , mineralogy , composite material , chemistry , optoelectronics , chromatography
MnCO 3 ‐modified Ba(Zr 0.3 Ti 0.7 )O 3 relaxor ferroelectric ceramics were fabricated by using the solid‐state reaction method. The temperature dependences of electrical and dielectric properties of the ceramics were systematically investigated over the range −140 to 400 °C. The typical ferroelectric relaxor behavior of the Ba(Zr 0.3 Ti 0.7 )O 3 ceramics was greatly suppressed by adding a proper amount of MnCO 3 . The suppressed relaxor behavior can be restored by annealing the samples in air, which is attributed to the presence of oxygen vacancies in the samples. In the paraelectric phase region, the low‐frequency dielectric relaxations associated with oxygen vacancies are observed above room temperature, and increase with increasing of Mn content. Compared to the undoped Ba(Zr 0.3 Ti 0.7 )O 3 ceramic, Mn‐doped samples display excellent temperature stability in a wide temperature. The critical composition of x = 0.05 (MnCO 3 ) not only exhibits a lower degree of ferroelectric relaxor behavior (Δ T m = 5.6 K), but also maintains a relatively higher tunability (66.9%@30 kV cm −1 ) than that of pure Ba(Zr 0.3 Ti 0.7 )O 3 (Δ T m = 16.5 K, 49.6%@30 kV cm −1 ).