Characterization and dielectric properties of Sr4M2Ti4Ta6O30 (M = Pr and Eu) ceramics

被引:6
作者
Li, Chunchun [1 ,2 ]
Fang, Liang [1 ,2 ]
Peng, Xiyang [1 ,2 ]
Hu, Changzheng [1 ,2 ]
Wu, Bolin [2 ]
机构
[1] Guilin Univ Technol, State Key Lab Breeding Base Nonferrous Met & Spec, Guilin 541004, Peoples R China
[2] Guilin Univ Technol, Key Lab Nonferrous Mat & New Proc Technol, Minist Educ, Guilin 541004, Peoples R China
关键词
Dielectrics; Ceramic; Ferroelectric; Tungsten bronze; DIFFUSE PHASE-TRANSITION; FERROELECTRIC PROPERTIES; HIGH PERMITTIVITY; SR5RTI3NB7O30; R; SM; LA; ND; GD; DY; LN;
D O I
10.1016/j.jallcom.2010.03.212
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Polycrystalline samples of Sr4Pr2Ti4Ta6O30 (SPIT) and Sr4Eu2Ti4Ta6O30 (SETT) were prepared by a high temperature solid-state reaction technique. The formation, structure, dielectric and ferroelectric properties of the compounds were studied. Sr4Eu2Ti4Ta6O30 is found to be a ferroelectric phase with filled tetragonal tungsten bronze (TB) structure at room temperature and undergoes a diffuse type ferroelectric-paraelectric phase transition around 90 degrees C with relaxor properties, while Sr4Pr2Ti4Ta6O30 belongs to paraelectric phase with TB structure at room temperature. At 1 MHz, SPIT exhibits a high dielectric constant of 181 and a low dielectric loss of 3.6 x 10(-3) with a negative temperature coefficient of the dielectric constant (tau(epsilon)), and SETT has a high dielectric constant of 192 and low dielectric loss of 7.7 x 10(-3) with a positive tau(epsilon) at room temperature, and heterogeneous mixtures of SPTT and SETT or a solid solution between them might be used to manufacture a tungsten bronze-structured temperature-stable dielectrics. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:L9 / L11
页数:3
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