Microwave Dielectric Properties of the (1-x)(Mg0.9Co0.1)TiO3-x(Ca0.61La0.26)TiO3 Ceramics

doi:10.3724/SP.J.1077.2011.11060

Abstract

Abstract: The microwave dielectric properties of the (1-x)(Mg_0.9Co_0.1)TiO₃-x(Ca_0.61La_0.26)TiO₃(MCT-CLT) ceramics were investigated. The system was prepared using a conventional solid-state ceramic route. The objective of the present work is to compensate for the negative temperature coefficient of resonant frequency (τ_f) of (Mg_0.9Co_0.1)TiO₃ (MCT) by the addition of (Ca_0.61La_0.26)TiO₃ (CLT). The microwave dielectric properties are strongly correlated with the sintering temperature and the composition. Very dense MCT-CLT ceramics were prepared by sintering at 1300℃. When the ceramics were sintered at temperatures above 1300℃, the bulk density decreased and the dielectric properties deteriorated. With the increasing of x, the relative dielectric constant (ε_r) of the ceramics increases and the product of quality factor and resonant frequency (Q×f) decreases. For practical application, 0.87(Mg_0.9Co_0.1)TiO₃- 0.13(Ca_0.61La_0.26)TiO₃ (87MCT-13CLT) ceramics sintered at 1300℃ with a dielectric constant ε_r=22.4, a Q×f value of 35000 GHz and a temperature coefficient of resonance frequency (τ_f) of -8.7×10^-6/℃ was proposed in this paper.

Key words: (1-x)(Mg_0.9Co_0.1)TiO₃-x(Ca_0.61La_0.26)TiO₃ ceramics, microwave dielectric ceramics, dielectric constant, quality factor, temperature stable resonant frequency

CLC Number:

TQ174

LIU Hao, SHEN Chun-Ying, LU Zheng-Dong, QIU Tai. Microwave Dielectric Properties of the (1-x)(Mg_0.9Co_0.1)TiO₃-x(Ca_0.61La_0.26)TiO₃ Ceramics[J]. Journal of Inorganic Materials, 2011, 26(6): 664-668.

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Microwave Dielectric Properties of the (1-x)(Mg_0.9Co_0.1)TiO₃-x(Ca_0.61La_0.26)TiO₃ Ceramics

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