LaFeO_3の焼結に及ぼす添加剤の影響

概要

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As a part of the study on sintering, the effects of oxide additives on sintering of LaFeO_3 com-pacts were investigated in air. The density, isothermal shrinkage and grain growth of sintered bodies were measured in relation to the sintering time, temperature and oxide additives. The lattice constants of the specimens were obtained by using the X-ray diffraction method. The results are summarized as follows. (1) The sintering of LaFeO_3 was markedly promoted by the addition of TiO_2 or MnO_2 at the sintering temperature of 1450℃. The Cu_2O addition caused a liquid phase sintering and promoted sintering. (2) The grain boundary diffusion mechanism was recognized during the initial sintering in the temperature range of the present experiment. (3) The grain size of LaFeO_3 Sintered bodies without any additives was shown to be smaller than those with 5 mol% TiO_2, ZnO, and MnO_2 addition. The activation energy for grain growth obtained from the Arrhenius plot was found to be 150, 100, 93 and 103 kcal/mol, respectively. (4) The lattice constants of 20 mol% CaO additive specimen showed 0.036% increase along a axis and 0.127% decrease along c axis compared with those of LaFeO_3 specimen.
社団法人日本材料学会の論文
1976-06-15