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J. Korean Ceram. Soc. > Volume 36(11); 1999 > Article
Journal of the Korean Ceramic Society 1999;36(11): 1235.
두가지 형태의 columbite precursor 법에 제조된 $Pb(Ni,Nb)O_3-Pb(Zr, Ti)O_3$ 세라믹스에서의 유전 및 압전 특성에 및는 CuO 의 첨가영향
나은상, 최성철
한양대학교 세라믹공학과
Effect of CuO on Dielectric and Piezoelectric properties of $Pb(Ni,Nb)O_3-Pb(Zr, Ti)O_3$ Prepared from Two Types of Columbite Precursors
Pb(Ni,Nb)O3-Pb(Zr, Ti)O3 (hereafter PNN-PZT) ceramics were prepared using two type of columbite precursor and effect of CuO addition on microstructure dielectric and piezoelectric properties was investigated in the vicinity of MPB. CuO acted as sintering aids by the reaction with PbO which increased the amount of liquid phase and densification of PNN-PZT. The second phase formation and PbO volatilization which was detrimental to both dielectric and piezoeletric properties were suppressed. Especially the columbite precursor heat-treated at high temperature (120$0^{circ}C$) showed more homogeneous grain size lower PbO volatilization higher density and more desiable electrical properties than those of samples prepared at low temperature (100$0^{circ}C$) heat-treated one. By the addition of CuO sintering temperature of the system was lowered from 125$0^{circ}C$ to 100$0^{circ}C$ and the temperature dependence of piezoelectric constant of the specimens was decreased due to the increase of the curie temperature (Tc) As high-heat treated precursor was sintered with the addition of 0.8mol% CuO at 100$0^{circ}C$ for 2 h the specimen showed the electrical properties of $varepsilon$r=4400 kp=0.53 Qm=78,
Key words: $Pb(Ni,Nb)O_3-Pb(Zr, Ti)O_3$ Columbite, Sintering aid, CuO
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