LiOH-Al_2O_3-Al(OH)_3-NaOH系原料からのγーLiAlO_2針状結晶の合成

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In this paper the most suitable addition ratio of Al(OH)_3 for the growth of needle-shaped β-LiAlO_2 crystals with diameters ≤1μm and length/diameter ratio ≥10 was examined in the LiOH-Al_2O_3-Al(OH)_3-NaOH system. The needle-shaped β-LiAlO_2 crystals with a diameter of 0.9μm, length of 10.4 μm and a length/diameter ratio of 11.6 was obtained at a molar ratio of 41.7:7.3:6.2:44.8 in the LiOH-Al_2O_3-Al(OH)_3-NaOH system. It was revealed that the needle-shaped β-LiAlO_2 crystals were converted to γ-LiAlO_2 crystals without morphology change by heating from 750 to 1000℃ for 10 or 30h. The surface area of resulting needle-shaped γ-LiAlO_2 crystals was from 16 to 17m^2/g. The stability of the needle-shaped γ-LiAlO_2 crystals in alkali carbonates, the electrolyte of molten carbonate fuel cells, was examined. The needle-shaped γ-LiAlO_2 crystals derived from β-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
1996-03-01