Structure and Growth Mechanism of Lanthanum Chromate  

作　　者：李胜利 刘伟明 凌子愚 孙良成 敖青 付贵福 

机构地区：[1]Department of Materials Science and Engineering, Shandong University Jinan 250061, China [2]Baotou Rare Earths Institute, Baotou 014010, China

出　　处：《Journal of Rare Earths》2005年第1期17-19,共3页稀土学报（英文版）

基　　金：Project supported by the National"863"High Technology Project (2001AA327010) and the National Natural Science Founda tion of China (50362001)

摘　　要：The unit cell of lanthanum chromate was constructed by calculating equivalent points. By means of calculation of the hole octahedrally surrounded by O^(2-) ions, it was considered that the sintered property of lanthanum chromate and the stability of Cr-O octahedron might be promoted by mixing a little Ca^(2+) ions. The growth mechanism was discussed in terms of structural ledge observed by SEM, the surfaces of the structural ledges parallel to (001), (010) and (110) planes, respectively. The misfit between (110) and (001) planes is only 0.0021 on common atomic plane, and the interconnection of the structured ledge may occur during crystal growth.The unit cell of lanthanum chromate was constructed by calculating equivalent points. By means of calculation of the hole octahedrally surrounded by O^(2-) ions, it was considered that the sintered property of lanthanum chromate and the stability of Cr-O octahedron might be promoted by mixing a little Ca^(2+) ions. The growth mechanism was discussed in terms of structural ledge observed by SEM, the surfaces of the structural ledges parallel to (001), (010) and (110) planes, respectively. The misfit between (110) and (001) planes is only 0.0021 on common atomic plane, and the interconnection of the structured ledge may occur during crystal growth.

关 键 词：inorganic materials lanthanum chromate crystal growth structural ledge rare earths 

分 类 号：TB326[一般工业技术—材料科学与工程]