酸化亜鉛の焼結における混合効果

概要

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The sinterability of Li doped and In doped zinc oxide and the mixtures of doped zinc oxides has been studied by measuring the isothermal shrinkage of compacts and the surface area change in the temperature range of 600° to 1200°C in air.The dopent, Li2O, was found to promote the sintering of zinc oxide and In2O3 to inhibit. The result is explained by the diffusional transfer of interstitial zinc ions which have been controlled by the dopents.On the free sintering, powder mixtures of Li doped and In doped zinc oxide were found to have the greatest sinterability among pure, Li doped, In doped zinc oxides, and the mixtures. This result is explained by considering the electrostatic field caused by an electron rearrangement between In doped zinc oxide with higher Fermi level and Li doped zinc oxide with lower Fermi level. This electrostatic field between two oxides is thought to make good contact between particles and to enhance the sinterability of the mixtures of doped zinc oxides.On the sintering of compacts, however, no enhancement of the sinterability of the mixtures was observed. This unexpected result may be explained by assuming that the electrostatic force between the particles with different dopents is weaker than the compacting force of tablets.
社団法人日本セラミックス協会の論文
1969-10-01