棒状のβ-LiAlO_2から同形状のγ-LiAlO_2結晶への変態及びγ-LiAlO_2のアルカリ炭酸塩に対する安定性について

概要

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The phase transformation of rod shaped p LiAI02 crys tals synthesized in the LiOH Al_2O_3 NaOH system with a molar ratio of 43.0 : 10.8 : 46.2 to y-LiAlO_2 crystals was examined. It was revealed that rod shaped β LiAl0_2 crystals (1.5 μm in diameter and 13 to 14 pm in length) modified to γ LiAlO_2 crystals without morphol ogy change by heating to 700, 750, 800, 900 and 1000℃ for 10 to 30h. The surface areas of resulting rod shaped γ LiAlO_2 crystals were larger than 10 m^2/g. The stability of rod shaped p LiAlO_2 and γ LiAlO_2 crys tals in alkali carbonates, an electrolyte of molten car bonate fuel cells, was examined. The original rod shaped p LiAlO_2 crystals nrixed with alkali carbonates deformed by the heat treatment at 650℃ for 500h, whereas rod shaped y LiAlO_2 crystals derived from P LiAlO_2 at 900℃ for 10h underwent no deformation by the heat treatment at 650℃ for 1000h.
社団法人日本セラミックス協会の論文
1994-06-01