Structural and dielectric properties of Sr5RTi3Ta7O30 (R = Sm, Y) ceramics

被引：33

作者：

Fang, L ^{[1
]}

Zhang, H ^{[1
]}

Yang, JF ^{[1
]}

Meng, FH ^{[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 / 11期

基金：

中国国家自然科学基金;

关键词：

X-ray diffraction; dielectrics; ceramics; tungsten bronze; tantalates; microstructure;

D O I：

10.1016/j.matlet.2003.10.051

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Sr5RTi3Ta7O30 (R = Sm, Y) ceramics were prepared and characterized. Sr5RTi3Ta7O30 (R = Sm, Y) belong to paraelectric phases of filled tetragonal tungsten bronze (TB) structure at room temperature. Phase transitions around 0 degreesC for Sr5YTi3Ta7O30 and around -40 degreesC for Sr5SmTi3Ta7O30 were observed by DSC measurements. Sr5SmTi3Ta7O30 and Sr5YTi3Ta7O30 ceramics show high dielectric constant of 116 and 108 together with low dielectric loss 4.2 x 10(-3) and 4.5 x 10(-3) at 1 MHz, respectively. In comparison with Ba-based ceramics with TB structure, the temperature coefficients of the dielectric constant (tau(epsilon)) are significantly reduced. (C) 2004 Elsevier Inc. All rights reserved.

引用

页码：1777 / 1780

页数：4

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