耗散因子
材料科学
铁电性
电介质
陶瓷
介电常数
相对介电常数
大气温度范围
放松(心理学)
相(物质)
压电
相变
分析化学(期刊)
介电损耗
矿物学
凝聚态物理
热力学
化学
复合材料
光电子学
物理
有机化学
心理学
社会心理学
作者
Yun-Wen Liao,Dexuan Xiao,Zhiwen Yu,Yi Lan Deng
标识
DOI:10.1016/j.matchemphys.2007.08.008
摘要
Lead-free piezoelectric ceramics, Bi0.5(Na1−x−yKxAgy)0.5TiO3, were prepared by a solid-state reaction process, and the dielectric property and phase structure of Bi0.5(Na1−x−yKxAgy)0.5TiO3 ceramics were investigated. XRD patterns show that the MPB of BNKAT(x/0.02) system ceramics lies in the composition range of 0.175 ≤ x ≤ 0.20. The relative permittivity ɛr and loss tangent tan δ vary with the K+ content and show a strong temperature- and frequency-dependent behavior in the temperature range measured. The K+ content strongly influences the transition temperature from ferroelectric to anti-ferroelectric phase. In the high-temperature range, the thermal variation of the relative permittivity at various frequencies is well described by the law (1/ɛr) − (1/ɛr,m) = C(T − Tm)α. Such a relaxation behavior may be ascribed to the cations disorder of Na+, K+, Ag+, Bi3+ at A-site.
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