J. Korean Ceram. Soc. > Volume 22(2); 1985 > Article
 Journal of the Korean Ceramic Society 1985;22(2): 17.
 첨가제에 따른 $Pb(Mg_{1/2} W_{1/2}) O_3-PbTiO_3-ObZrO_3$ 고용체의 특성에 대한 연구 안영필, 황학인, 홍진녕 한양대학교 무기재료공학과 The Study of the Properties of $Pb(Mg_{0.15} W_{0.15})Ti_{0.35}-Zr_{0.35}O_3$ Ceramics Modified with $La_2O_3$, $Nb_2O_5$ and $Al_2O_3$ ABSTRACT In the composition of $Pb(Mg_{0.15} W_{0.15})Ti_{0.35}-Zr_{0.35}O_3$ the effect of particle size on PbO vaporization were measured, . The initial step of discontinuous vaporization of unreated PbO during the calcining process was depended on the particle size. All additives $La_2O_3Nb_2O_5$ and $Al_2O_3$ inhibited the grain growth of the composition $Pb(Mg_{0.15} W_{0.15})Ti_{0.35}-Zr_{0.35}O_3$ +2wt% excess PbO. The dielectric and piezoelectric properties of the composition $Pb(Mg_{0.15} W_{0.15})Ti_{0.35}-Zr_{0.35}O_3$ were improved by the addition of 2wt% excess PbO and proper additive. The electromechanical planar coupling factor of 0.65 and mechnical quality factor of 390 could be obtained by adding 5wt% $Nb_2O_5$ to the composition 2wt% excess PbO+$Pb(Mg_{0.15} W_{0.15})Ti_{0.35}-Zr_{0.35}O_3$
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