The Effects of <TEX>$MnO_2$</TEX> and <TEX>$Cr_2O_3$</TEX> on Piezoelectric Properties of <TEX>$Pb(Mg_{1/2}W_{1/2})_{0.3} Ti_{0.4} Zr_{0.3}O_3$</TEX> Ceramics

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J. Korean Ceram. Soc. > Volume 19(4); 1982 > Article

Journal of the Korean Ceramic Society 1982;19(4): 293.

$MnO_2$ 및 $Cr_2O_3$ 가 $Pb(Mg_{1/2}W_{1/2})_{0.3} Ti_{0.4} Zr_{0.3}O_3$ Ceramics의 압전성질에 미치는 영향

안영필, 박종상

한양대학교 무기재료 공학과

The Effects of $MnO_2$ and $Cr_2O_3$ on Piezoelectric Properties of $Pb(Mg_{1/2}W_{1/2})_{0.3} Ti_{0.4} Zr_{0.3}O_3$ Ceramics

ABSTRACT

The effects of $MnO_2$ and $Cr_2O_3$ on the Piezoelectrictric properties of Pb(Mg1/2W1/2)0.3 Ti0.4 Zr0.3O3 Ceramics. Electromechanical properties in the system in connection with the sintering temperature and the effects of $MnO_2$ and $Cr_2O_3$ addition. The dielectric constant of the ceramics decreased with the additions of $MnO_2$ while the additions of $Cr_2O_3$ increased the value. The Planar coupling factor (Kp) of the ceramics with 0.2wt% $MnO_2$ and with 0.2wt% $Cr_2O_3$ gave the highest value of 0.52 and 0.513 as sintered at 106$0^{circ}C$, 108$0^{circ}C$, respectively. The value of mechanical Q-factor were in parallel with the fired density of the ceramics. The optical micrography of the sintered bodies showed that the additions of $MnO_2$ promoted the grain growth, while the additions of $Cr_2O_3$ retarded the grain growth.