High‐Temperature Dielectrics in the BiScO3–BaTiO3–(K1/2Bi1/2)TiO3 Ternary System
High‐Temperature Dielectrics in the BiScO3–BaTiO3–(K1/2Bi1/2)TiO3 Ternary System
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DOI：
10.1111/j.1551-2916.2009.02973.x
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发表时间：
2009-03
影响因子：
3.9
通讯作者：
J. Lim;Shujun Zhang;Namchul Kim;T. Shrout
中科院分区：
文献类型：
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作者：
J. Lim;Shujun Zhang;Namchul Kim;T. Shrout
采用常规烧结和热等静压法合成了（1−x）[0.4BiScO3-0.6BaTiO3]+x（K1/2Bi 1/2）TiO 3 [BSBT-KBTx]系统的PerxO 3固溶体。研究了不同KBT掺杂量的BSBT陶瓷的介电性能随温度和频率的变化规律，并对BSBT陶瓷在高温电容器中的应用进行了探讨。在100° ~ 300°C的温度范围内，BSBT陶瓷具有较高的介电常数（室温下>1700）和较低的介电损耗，且介电常数温度系数（TC_s）较平坦。此外，观察到具有增加的KBT的BSBT陶瓷在温度（>RT）下具有在铅基弛豫剂中观察到的介电弛豫特性。此外，从电场极化行为观察到BSBT-KBT 20陶瓷在220 kV/cm下的高能量密度为4.0 J/cm 3。
Perovskite solid solution in the (1−x)[0.4BiScO3–0.6BaTiO3]+x (K1/2Bi1/2)TiO3 [BSBT–KBTx] system was synthesized using conventional sintering and hot-isostatic pressing. Dielectric properties of BSBT ceramics with different dopant levels of KBT were characterized as a function of temperature and frequency for potential use of high-temperature capacitors. The BSBT ceramics with KBT exhibited high dielectric permittivities (ɛr) (>1700 at RT) and low dielectric loss over the temperature range from 100° to 300°C, with flat temperature coefficients of permittivity (TCɛs). In addition, BSBT ceramics with increasing KBT were observed to possess dielectric relaxation characteristics at temperatures (>RT) as observed in lead-based relaxors. Furthermore, high energy densities, being on the order of 4.0 J/cm3 at 220 kV/cm was observed for the BSBT–KBT20 ceramics from the electric-field polarization behavior.