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Structure and Dielectric Properties of Re 0.02 Sr 0.97 TiO 3 ( Re = La , Sm , Gd , Er ) Ceramics for High‐Voltage Capacitor Applications
Author(s) -
Shen ZongYang,
Hu QiGuo,
Li YueMing,
Wang ZhuMei,
Luo WenQin,
Hong Yan,
Xie ZhiXiang,
Liao RunHua
Publication year - 2013
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.12364
Subject(s) - materials science , ceramic , dielectric , strontium titanate , analytical chemistry (journal) , perovskite (structure) , mineralogy , strontium , grain size , composite material , crystallography , chemistry , optoelectronics , organic chemistry , chromatography
Rare–earth‐doped strontium titanate ceramics yielding the formula Re 0.02 Sr 0.97 TiO 3 ( Re – ST , Re = La, Sm , Gd , Er ) were prepared by solid‐state reaction route. All Re – ST ceramics had single cubic perovskite structure similar to pure SrTiO 3 ( ST ). The grain size of Re – ST ceramics dramatically decreased to 1–10 μm, depending on different rare‐earth elements, as compared to ~30 μm of pure ST . The relative dielectric constant of Re – ST ceramics (ε r = 2750–4530 at 1 kHz) showed about 10–15 times higher than that of pure ST (ε r = 300 at 1 kHz), whereas the dielectric loss of Re – ST ceramics still remained lower than 0.03 (at 1 kHz) at room temperature. Under 0–1.63 × 10 6 V/m bias electric field testing conditions, the ε r of Re – ST ceramics at room temperature changed within 14%. The P – E results indicated that the Re – ST ceramics were linear dielectrics. Together with their relatively high breakdown strength ( E b > 1.4 × 10 7 V/m), the Re – ST ceramics could be very promising for high‐voltage capacitor applications. Meanwhile, the temperature stability of the ε r of Re – ST ceramics was evaluated in a temperature range of −60°C–200°C.