固相法によるTazheraniteの粉末合成と導電性

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タイトル別名
  • Preparation of Tazheranite Powders by Solid Phase Reaction and Conductivity of Sintered Bodies
  • コソウホウ ニ ヨル Tazheranite ノ フンマツ ゴウセイ ト ドウ

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抄録

Ca0.20Zr0.80-xTixOy composition (x=0.04-0.25) powders, whose phases were the tazheranite (x=0.04-0.10) and the calzirtite (x=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 x=0.15 by firing them at 1500°C for 4-10h. The conductivity of the sintered bodies, fabricated at 1500°C for 4h in x=0.04-0.15 and 10h in x=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 x=0.04-0.15 composition samples, the resistance of grain decreased with an increase of x, while that of grain boundary increased. With regard to the calzirtite (x=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 TiO2 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.

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