Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (04): 609-613.doi: 10.3866/PKU.WHXB20070431

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Synthesis and Microwave Dielectric Properties of (Ca1-xMgx)SiO3 Ceramic by Sol-Gel Process

WANG Huan-Ping; ZHANG Qi-Long; YANG Hui; SUN Hui-Ping   

  1. College of Material Science and Chemical Engineering, Zhejiang University, Hangzhou 310027, P. R. China
  • Received:2006-10-16 Revised:2006-11-29 Published:2007-04-05
  • Contact: ZHANG Qi-Long

Abstract: Using Ca(NO3)2·4H2O, Mg(NO3)2·6H2O and Si (OC2H5)4 as precursors, (Ca1-xMgx)SiO3 powders were prepared by sol-gel method with varying x (0.1, 0.2, 0.3, 0.4, 0.5). The phase constitution, sintering characteristic and dielectric properties of (Ca1-xMgx)SiO3 ceramics were studied. The results showed that the solubility limitation of Mg2+ in CaSiO3 was below 0.2 and CaSiO3 phase was transformed into CaMgSi2O6 phase with substituting Ca2+ by Mg2+. When x was 0.3, the growth of grains was restrained and pores were decreased due to the coexistence of CaSiO3 and CaMgSi2O6, and then the ceramic density was enhanced. The dielectric constant and quality factor of (Ca0.7Mg0.3)SiO3 ceramic sintered at 1320 ℃ were 6.62 and 36962 GHz, respectively.

Key words: Sol-gel, Low dielectric constant, CaO-MgO-SiO2, Microwave dielectric ceramic