摘要
通过晶体化学等效点系计算,绘制了正交结构的铬酸镧晶体单胞。对氧八面体间隙计算表明Ca的掺杂有利于Cr与O形成一种稳定结构,并促进铬酸镧的烧结。讨论了铬酸镧材料的结构特征。在扫描电镜下观察到了铬酸镧的生长台阶,并对其生长机制进行了分析和讨论。发现烧结铬酸镧表面存在明显的生长台阶,晶粒以台阶方式长。晶粒的生长表面为(001),(010)和(100)晶面。铬酸镧的(110)晶面和(001)晶面的错配度仅为0.0021,在生长过程中存在这两个晶面的交互生长。
The unit cell of lanthanum chromites 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 chromites might be promoted by mixing a little Ca^(2-) ions which improves the stability of Cr-O octahedron. The growth mechanism was discussed through analyzing the growth step observed by SEM.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2003年第5期534-536,共3页
Journal of the Chinese Society of Rare Earths
基金
国家"十五""863"(2001AA327010)
山东省中青年科学家基金资助(02BS061)项目
关键词
无机非金属材料
铬酸镧
晶体结构
台阶生长
稀土
inorganic materials
lanthanum chromites
crystal structure
growth step
rare earths
