Effect of A-Site Substitution on the Dielectric Properties of PZN Ceramics

A-자리 치환에 따른 PZN 세라믹스의 유전특성

  • 조상희 (경북대학교 무기재료공학과) ;
  • 백종갑 (경북대학교 무기재료공학과) ;
  • 손정호 (경북대학교 무기재료공학과) ;
  • 김정주 (경북대학교 무기재료공학과) ;
  • 김남경 (경북대학교 무기재료공학과)
  • Published : 1995.05.01

Abstract

The effects of A-site substitution with alkaline-earth ions (Ca, Sr and Ba) on the perovskite-phase formation and dielectric properties for Pb1-xMx(Zn1/3Nb2/3)O3 (0.0 x 0.5)-based relaxors were studied. Considerable improvements in the sinterability and the extent fo perovskite formation were observed with increasing the A-site substitution (x) and sintering temperature. The maximum dielectric permittivity appeared at x=0.1 for Sr and Ba substitutiion, while the relative dielectric permittivity was almost invariant in the case of Ca ion substitution. Curie temperature decreased with increasing relative amount of Sr and Ba ions but was almost invariant in case of Ca ion substitution. With increasing the amount of x, the diffuseness parameter ($\delta$) increased but the maximum dielectric constant decreased, demonstrating an enhanced diffuse phase transition (DPT) in the presence of alkaline-earth cations.

Keywords

$Pb1-xMx(Zn_{1/3}Nb_{2/3})O_3$;A-site substitution;Dielectric property;Diffuse phase transition

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