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Dielectric Properties of Cr2O3 Doped (Ba,Sr,Ca)TiO3 Ceramics for Tunable Microwave Devices

Published online by Cambridge University Press:  26 February 2011

Bing Qin ,
Dengren Jin ,
Jinrong Chen  and
Zhongyan Meng
Bing Qin
Affiliation:
[email protected], Shanghai University, Materials Science and Engineering, NO.149 Yanchang Rd, Shanghai, 200072, China, People's Republic of, +862156338852
Dengren Jin
Affiliation:
[email protected], Shanghai University, School of Materials Science and Engineering, No.149 Yanchang Rd., Shanghai, 200072, China, People's Republic of
Jinrong Chen
Affiliation:
[email protected], Shanghai University, School of Materials Science and Engineering, No.149 Yanchang Rd., Shanghai, 200072, China, People's Republic of
Zhongyan Meng
Affiliation:
[email protected], Shanghai University, School of Materials Science and Engineering, No.149 Yanchang Rd., Shanghai, 200072, China, People's Republic of
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Abstract

Cr2O3-doped (Ba0.55Sr0.4Ca0.05)TiO3 ceramics were fabricated by the mixed-oxide method. Their dielectric properties were investigated with the variation of Cr3+ doping concentrations (0∼2.0mol%). All the BSCT specimens owned dense and homogeneous structure. Doping of Cr3+ could reduce the Curie temperature and their dielectric constant peak values, and improve the thermal stabilities of their dielectric properties. Both the dielectric constant and dielectric loss of the BSCT ceramics were reduced by doping Cr ions when the dopant concentration was lower than 1.5mol%. 1.0mol% Cr-doped BSCT specimens are expected to be the candidate materials for microwave tunable devices, whose tunability, dielectric constant and loss were 16.1%, 2700 and 0.24% respectively.

Keywords

ceramicdopantdielectric properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 966: Symposium T – Ferroelectrics and Multiferroics , 2006 , 0966-T10-12
Copyright
Copyright © Materials Research Society 2007

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