Microwave dielectric properties of tunable Ba0.5Sr0.5TiO3 and scheelite AMoO4 (A = Ba, Sr) composite ceramics

被引：16
作者：
Tang, Linjiang [1 ]
Zhai, Jiwei [1 ]
Zhang, Haijun [2 ]
Yao, Xi [1 ]
机构：
[1] Tongji Univ, Funct Mat Res Lab, Shanghai 200092, Peoples R China
[2] Wuhan Univ Sci & Technol, Coll Mat & Met, Wuhan 430081, Hubei Province, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2013年 / 551卷
关键词：
Composites; Tunability; Microwave property;
D O I：
10.1016/j.jallcom.2012.10.189
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：
(1 - x)Ba0.5Sr0.5TiO3-xAMoO(4) (A = Ba, Sr) ceramics with x = 5, 10, 20 and 30 wL% were prepared by traditional solid-state reaction method. Two crystalline phases, a cubic perovskite structure Ba0.5Sr0.5TiO3 (BST) and a tetragonal scheelite structure AMoO(4) were observed by XRD analysis. The microwave dielectric properties of Ba0.5Sr0.5TiO3-AMoO(4) composite ceramics were investigated systematically. With increasing content of AMoO(4) from 5% to 30%, the dielectric anomalous peaks of ferroelectric-paraelectric phase transition for the composite ceramics are suppressed and broadened. The results show that the composite ceramics exhibited promising microwave properties. Especially, in the (1 - x) Ba0.5Sr0.5TiO3-xSrMoO(4) system the dielectric constant can be adjusted in the range from 1200 to 132, while maintaining tunability from 38.3% to 6.4% (60 kV/cm) and Q values more than 259 in the gigahertz frequency region. So (1 - x)Ba0.5Sr0.5TiO3-xSrMoO(4) composite ceramic is a promising candidate for electrically tunable microwave device applications. (C) 2012 Elsevier B.V. All rights reserved.
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收藏
页码：556 / 561
页数：6
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