Journal of Inorganic Materials

• Research Letter • Previous Articles    

Study on the (1-x)(Mg0.7Zn0.3)TiO3x(Ca0.61Nd0.26)TiO3 Microwave Dielectric Ceramics

LU Zheng-Dong, SHEN Chun-Ying, LI Liang,YANG Jian, QIU Tai   

  1. College of Materials Science and Engineering,Nanjing University of Technology,Nanjing 210009,China
  • Received:2009-07-23 Revised:2009-11-04 Published:2010-03-20 Online:2010-03-20

Abstract: The microwave dielectric properties of the (1-x)(Mg0.7Zn0.3)TiO3x(Ca0.61Nd0.26)TiO3(MZCNT) system 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 (τf) of (Mg0.7Zn0.3)TiO3 by the addition of (Ca0.61Nd0.26)TiO3. The microwave dielectric properties are strongly correlated with the sintering temperature and the composition. Very dense MZCNT ceramics were synthesized by sintering at 1250℃, when sintered at temperatures above 1300℃, the decomposition of (Ca0.61Nd0.26)TiO3 and evaporation of Zn resulted the decrease in density and degradation in dielectric properties. With increasing (Ca0.61Nd0.26)TiO3, the dielectric constant (εr) increased and the quality factor Q×f decreased. For practical application, 0.87(Mg0.7Zn0.3)TiO3-0.13(Ca0.61Nd0.26)TiO3 ceramics sintered at 1250℃ with a dielectric constant εr~24.3, a Q×f value of 34000GHz and a temperature coefficient of resonance frequency (τf) of -9×10-6/℃ is proposed in this paper.

Key words: (1-x)(Mg0.7Zn0.3)TiO3x(Ca0.61Nd, dielectric constant, quality factor, temperature stable resonant frequency

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