掺镁铌酸钾锂晶体的介电性和热释电性  

Mg Doping Li_3K_2Nb_5O_(15) and its Dielectric and Pyroelectric Properties

作　　者：赵明磊[1] 王小素 李长鹏[1] 张沛霖[1] 钟维烈[1] 王春雷[1] 程振祥[2] 陈焕矗[2] 

机构地区：[1]山东大学物理系,济南250100 [2]山东大学晶体材料研究所,济南250100

出　　处：《压电与声光》2000年第6期394-397,共4页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目!(6 97770 17)

摘　　要：在 10～ 70 0 K温度范围内 ,研究了掺 Mg的铌酸钾锂 (L i3K2 Nb5 O1 5 )单晶的 c、a片的介电温度特性和低温热释电性质 ,测量了在 5× 10 2 ～ 5× 10 8Hz频率范围内介电常数和频率的依赖关系。结果表明 ,除了在 6 2 3 K附近有一铁电 -顺电相变以外 ,在 80 K左右还存在铁电 -铁电相变 ,其介电弛豫频率在 2 5 0 MHz左右。The dielectric temperature properties and low temperature pyroelectric properties of Mg doping Li 3K 2Nb 5O 15 single crystal plates in a and c direction are investigated over a 10～700 K temperature range.The dependence of dielectric constant on frequency is measured in range of 5×10 2～5×10 8 Hz.Experimental result shows that a ferroelectric paraelectric phase transition is found around 623 K with addition of frerrelectric ferroelectric one around 80 K.The dielectric relaxation frequncy is about 250 MHz.

关 键 词：掺镁 铌酸钾锂晶体 热释电性 掺杂 单晶 介电性 

分 类 号：O731[理学—晶体学]