Synthesis of <TEX>$Pb(Mg_{1/3}Nb_{2/3})O_3$</TEX> powder by Solvent Evaporation and its Dielectric Property

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J. Korean Ceram. Soc. > Volume 33(1); 1996 > Article

Journal of the Korean Ceramic Society 1996;33(1): 17.

용매 증발법에 의한 $Pb(Mg_{1/3}Nb_{2/3})O_3$ 분말 합성 및 유전 성질

이종필, 이종국¹, 강상구, 김환

서울대학교 무기재료공학과
¹조선대학교 재료공학과

Synthesis of $Pb(Mg_{1/3}Nb_{2/3})O_3$ powder by Solvent Evaporation and its Dielectric Property

ABSTRACT

Pb(Mg1/3Nb2/3)O3 powder with high purity chemical homogeniety and reactivity was prepared by solvent eva-poration of common solution. The common solution was fabricated using a Pb(NO3)2 Mg(NO)3 and NB solution which was prepared by dissolving NbC in H2O2 acquous solution. In precusor powder prepared by solvent evaporation method the synthetic temperature of Pb(Mg1/3 Nb2/3)O3 phase was lowered. And the formation of homogeneous Pb(Mg1/3Nb2/3)O3 phase was enhanced but the formation of pyrochlore phase was reduced. The dielectric constant of PMN ceramics from the synthesized powder was found to increase with both sintering temperature and excess MgO and subsequent analysis of the microstructures confirmed that this was due to an increase in grain size. The grain size dependence is explained as a consequence of low-permittivity grain boundaries.

Key words: $Pb(Mg_{1/3}Nb_{2/3})O_3$ Solvent evaporation, Pyrochlore phase, Dielectric property, Excess MgO