Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Structure and Dielectric Properties of $(Ba_{1-x}Ca_x)(Mg_{1/3}Ta_{2/3})O_3$ Ceramics

$(Ba_{1-x}Ca_x)(Mg_{1/3}Ta_{2/3})O_3$ 세라믹스의 구조와 유전특성

  • 조정호 (부경대학교 공과대학 전자공학과) ;
  • 조종래 (부경대학교 공과대학 전자공학과) ;
  • 김강언 (부경대학교 공과대학 전자공학과) ;
  • 정수태 (부경대학교 공과대학 전자공학과)
  • Published : 2000.05.13
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Abstract

The structural changes and the dielectric properties of $(Ba_{1-x}Ca_x)(Mg_{1/3}Ta_{2/3})O_3$ (x=0, 0.2, 0.4, 0.6, 0.8, 1) were investigated. The densities of samples were gradually decreased with increasing x, (BMT=7.69, CMT=5.25 $g/cm^3$). The crystal structure of BMT was a untiltied perovskite structure, however BCMT showed antiphase tilting and antiphase-inphase tilting structure. The dielectric constant($\varepsilon_r$) of the highest value was 33 at x=0.2 (BMT=24, CMT=17). The maximum quality factor was 27,500GHz in BMT. The quality factor· of BCMT was decreased to x<0.2 (5,000GHz), and was gradually increased to x>0.2. The temperature coefficients of dielectric constant was positive at x<0.8, and negative in CMT.

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