Structural and dielectric properties of Ba5LnSn3Nb7O30 (Ln=La, Nd) ceramics

被引：38
|
作者：
Fang, L [1 ]
Chen, L [1 ]
Zhang, H [1 ]
Diao, CL [1 ]
Yuan, RZ [1 ]
机构：
[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China
来源：
MATERIALS LETTERS | 2004年 / 58卷 / 21期
基金：
中国国家自然科学基金;
关键词：
X-ray diffraction; dielectrics; Tungsten bronze; niobates; microstructure;
D O I：
10.1016/j.matlet.2004.03.042
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Two novel Ba(5)LnSn(3)Nb(7)O(30) (Ln = La, Nd) ceramics were prepared and characterized. Both compounds are paraelectric phases adopting the filled tetragonal tungsten bronze (TB) structure at room temperature. Ba5LaSn3Nb7O30 and Ba5NdSn3Nb7O30 ceramics show high dielectric constant of 171 and 182 together with low dielectric loss 1.2 x 10(-3) and 1.8 x 10(-3) at 1 MHz, respectively. In comparison with dielectric ceramics with TB structure in BaO-Ln(2)O(3)-TiO2-Ta2O5 (Ln = La, Nd) system, the temperature coefficients of the dielectric constant (tau(epsilon)) are significantly reduced. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码：2654 / 2657
页数：4
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