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PMN-PZT계 세라믹스의 압전특성에 미치는 MnO<sub>2</sub>의 영향
김재창,황동연,이미영,유신욱,김영민,어순철,김일호,Kim J.-C,Hwang D.-Y,Lee M.-Y,You S.-W,Kim Y.-M,Ur S.-C,Kim I.-H 한국재료학회 2004 한국재료학회지 Vol.14 No.5
Perovskite PMN-PZT-based ceramics were prepared and the$ MnO_2$ doping effects on their piezoelectric properties were investigated. Grain size decreased with increasing the $MnO_2$ content, and the pyrochlore phase was not identified in the sintered PMN-PZT ceramics with 0.01~1.0wt% $MnO_2$. Piezoelectric voltage and charge constants were reduced and mechanical quality factor increased with increasing the $MnO_2$ content. However, electromechanical coupling coefficient slightly decreased with increasing the MnO$_2$ content without regard to the grain size.
PMS-PZT 세라믹스의 압전특성에 미치는 ZnO의 영향
손영진,황동연,김재창,조경원,김영민,어순철,김일호,Son Y.-J.,Hwang D.-Y.,Kim J.-C.,Cho K.-W.,Kim Y.-M.,Ur S.-C.,Kim I.-H. 한국재료학회 2004 한국재료학회지 Vol.14 No.11
Perovskite Pb(Mn_{1/3}Sbu_{2/3})O_2-Pb(Zr,Ti)O_3\;(PMS-PZT) was prepared and ZnO doping effects on its piezoelectric properties were investigated. Pyrochlore phase was not identified in the PMS-PZT ceramics with $0\sim5\;mol\%$ ZnO sintered at $1100^{\circ}C$ for 2 hrs, and maximum sintered density of $7.92 g/cm^3$ was obtained. Piezoelectric charge constant and voltage constant increased to $359{\times}10^{-12}\;C/N\;and\;22.5{\times}10^{-13}\;Vm/N$, respectively, with increasing ZnO content. Mechanical quality factor reduced considerably with increasing ZnO content. When the ZnO content was 3 $mol\%$, electromechanical coupling factor and relative dielectric constant showed maximum values of $56\%$ and 1727, respectively. This should be evaluated by complicated variations of sintered density, tetragonality of lattice, grain size, and A-site vacancy generated by ZnO addition and $Zn^{2+}$ substitution.