Effects of TiO2 Content in TiO2(Ti) Powder and Particle Size of Ti Powder on PTCR Characteristic of (Ba,Sr)TiO3 Vacuum-Sintered Compacts Added with TiO2(Ti) and Ti Powders.

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  • Kim Jun-Gyu
    Institute of Industrial Science, The University of Tokyo
  • Hayashi Koji
    Institute of Industrial Science, The University of Tokyo

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  • ＴｉＯ２（Ｔｉ）粉およびＴｉ粉添加（Ｂａ，Ｓｒ）ＴｉＯ３真空焼結体のＰＴＣＲ特性に及ぼすＴｉＯ２（Ｔｉ）粉中ＴｉＯ２量およびＴｉ粉粒度の影響
  • TiO2 Ti コナ オヨビ Tiフン テンカ Ba Sr Ti03 シンクウ ショウケツタイ ノ PTCR トクセイ ニ オヨボス Ti02 Ti コナ チュウ Ti02リョウ オヨビ Ti フンリュウド ノ エイキョウ

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Abstract

The effects of TiO2 contents (or thickness of TiO2 surface layer) in TiO2(Ti) powder and the grain size of Ti powder (or interparticle spacing of Ti particles) on the PTCR characteristic of the (Ba, Sr)TiO3 compact added with TiO2(Ti) or Ti, which were sintered in vacuum at 1623K for 3.6ks, were investigated.<BR>The results obtained were as follows; (1)With increasing TiO2 content of the TiO2(Ti) from 12.5mass% to 25 and 37.5mass%, the range of metallic Ti content in TiO2(Ti) needed for the development of PTCR characteristic became 1.7 times larger at maximum. (2)For the sintered compact added with 2μm Ti powder, the range of Ti content needed for the development of PTCR characteristic was larger than that of the compact with 18μm Ti powder. (3)The above phenomena seemed to be due to the homogenization of oxygen ion concentration in (Ba, Sr)TiO3 particles which are caused by increasing thickness of TiO2 layer or decreasing interparticle spacing of Ti particles.

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