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Microwave dielectric properties of low loss and highly tunable Ba0.5Sr0.5Ti1−3y/2WyO3 ceramics

Published online by Cambridge University Press:  12 January 2012

Mingwei Zhang ,
Jiwei Zhai ,
Bo Shen  and
Xi Yao
Mingwei Zhang
Affiliation:
Functional Materials Research Laboratory, Tongji University, Shanghai 200092, China
Jiwei Zhai*
Affiliation:
Functional Materials Research Laboratory, Tongji University, Shanghai 200092, China
Bo Shen
Affiliation:
Functional Materials Research Laboratory, Tongji University, Shanghai 200092, China
Xi Yao
Affiliation:
Functional Materials Research Laboratory, Tongji University, Shanghai 200092, China
*
a)Address all correspondence to this author. e-mail: apzhai@tongji.edu.cn
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Abstract

This article reports on microstructure and dielectric properties of Ba0.5Sr0.5Ti1−3y/2WyO3 ceramics. Dielectric peaks of the Ba0.5Sr0.5Ti1−3y/2WyO3 ceramics were markedly suppressed, broadened, and shifted to low temperature with increasing content of W. The limit of W incorporating into the barium strontium titanate (BST) lattice was y = 0.02. Two second phases (BaWO4 and Ba2Ti5O12) were formed above the solid solution limit of W in BST. The doping mechanism represents a new approach to develop microwave tunable materials. Dielectric properties of the Ba0.5Sr0.5Ti1−3y/2WyO3 ceramics could be optimized by the content of W. The sample with y = 0.05 had ε′ of 431, quality factor of 365 (at 2.111 GHz), and tunability of 11.5%, which makes a potential candidate for tunable microwave device applications in the wireless communication.

Keywords

CeramicDielectric propertiesDiffusion
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 6 , 28 March 2012 , pp. 910 - 914
Copyright
Copyright © Materials Research Society 2012

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