Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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The Dielectric Properties of $Ba_{1-x}A_x(Mg_{1/3}Nb_{2/3})O_3$(A=Sr, Ca) Ceramics for Microwave Resonator

마이크로파 공진자용$Ba_{1-x}A_x(Mg_{1/3}Nb_{2/3})O_3$(A = Sr, Ca)

  • 김부근 (부경대학교 전자공학과) ;
  • 김재윤 (부경대학교 전자공학과) ;
  • 김강언 (부경대학교 전자공학과) ;
  • 정수태 (부경대학교 전자공학과) ;
  • 조상희 (경북대학교 무기재료공학과)
  • Published : 2000.06.01
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Abstract

The structural changes and the microwave dielectric properties of $Ba_{1-x}$/A$_{x}$/(Mg$_{1}$3//Nb$_{2}$3/)O$_3$(A=Sr, Ca=x0, 0.2, 0.4, 0.6, 0.8, 1.0) were investigated. The densities of samples are gradually decreased with increasing x(BMN=6.1, SMN=5.22 and CMN=4.26 g/m$^3$)The crystal structure of BMN was untilting of oxygen octahedral. The structural changes of BSMN showed the antiphase tilting at x>0.4, and those of BCMN showed the antiphase tilting at 0.20.8. The variation of dielectric constant with Sr was small(BMN=32, SMN=30) However the variation with Ca was large the highest value was 42 at Ca=0.2(CMN=25) The maximum quality factor was 68,000 GHz at Sr=0.2 and the minimum quality factor was 3,000 GHz at Ca=0.2 (BMN=35,000, SMN=20,000 and CMN=23,000 GHz) The temperature coefficients of resonant frequency of BSMN were about 2 times larger than those of BCMN in all composition.ion.

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References

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