MgCl_2を用いたスピネル粉体の合成

概要

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MgAl_2O_3 powder was synthesized by heating a mixture sample consisting of Al_2O_3 and MgCl_2 (1:10 molar ratio). Two types of Al_2O_3 materials were used ; α-Al_2O_3 platelets and γ-Al_2O_3 powder. When the mixture consisting of α-Al_2O_3 platelets and MgCl_2 was heated at 750℃ for 2 h, the α-Al_2O_3 platelets completely changed to 1-2 μm MgAl_2O_4 grains with high crystallinity and a polyhedral shape such as a pentahedron or an octahedron. When the mixture consisting of γ-Al_2O_3 powder and MgCl_2 was heated at 750℃ for 2 h, the formation reaction of MgAl_2O_4 was completed, but its crystallinity was low. After heating the mixture at 1000℃ for 2 h, MgAl_2O_4 powder with high crystallinity was formed. Most of the grains had a polyhedral shape of 3-4 μm size and they attained a maximum size of 10 μm.
社団法人日本セラミックス協会の論文
2001-10-01