固相法によるTazheraniteの粉末合成と導電性 Preparation of Tazheranite Powders by Solid Phase Reaction and Conductivity of Sintered Bodies
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Ca<sub>0.20</sub>Zr<sub>0.80-<i>x</i></sub>Ti<sub><i>x</i></sub>O<sub><i>y</i></sub> composition (<i>x</i>=0.04-0.25) powders, whose phases were the tazheranite (<i>x</i>=0.04-0.10) and the calzirtite (<i>x</i>=0.20) of single phases, were prepared at 1300°C for 10h by the solid phase reaction. The range of the tazheranite composition was broadened up to <i>x</i>=0.15 by firing them at 1500°C for 4-10h. The conductivity of the sintered bodies, fabricated at 1500°C for 4h in <i>x</i>=0.04-0.15 and 10h in <i>x</i>=0.20, was measured at 400°-900°C using the complex impedance method in the air. The activation energies of the conductivity were 120-130kJ/mol, thus it is presumed that the mechanism of electric conduction was dominated by an oxygen ion conduction in the range of these temperatures. In the case of <i>x</i>=0.04-0.15 composition samples, the resistance of grain decreased with an increase of <i>x</i>, while that of grain boundary increased. With regard to the calzirtite (<i>x</i>=0.20) composition sintered body, it is made ascertained that the specific resistance took a figure up one place. The results have suggested that the elevation of conductivity is due to the increase of dissolved TiO<sub>2</sub> amount, the valence deviation of Ti, the change of grain size and the segregation of a trace amount of calzirtite phase at the grain boundaries of the tazheranite of single phase.
- Journal of the Ceramic Society of Japan
Journal of the Ceramic Society of Japan 100(1165), 1135-1139, 1992
The Ceramic Society of Japan