偏岭石与变高岭石微结构的区别

Difference in Microstructures of Pianlinite and Metakaolinite

采用广角度 X射线衍射 -散射 ( WAXS)测试技术和由此得到的径向分布函数 ( RDF) ,研究了偏岭石与变高岭石的结构差异 .结果表明 ,变高岭石是由非晶相和少量结晶相物质组成的半晶物质 ,而偏岭石是由非晶相和中间序态组成的准晶物质 .虽然两者均以非晶质相为主 ,并具有相似的近程结构模型 ,但在非晶质相中近邻八面体的连结方式和近邻四面体的连结有序性方面仍存在较大差异 .此外 。

The microstructure differences between pianlinite and metakaolinite were studied based on the wide angle X ray diffraction scattering technology and the radial distributing function for pianlinite and metakaolinite samples heated at different temperatures. The results show that the metakaolinite is a hemicrystal composed of non crystalline phase and a little crystalline phase, and the pianlinite is a quasicrystal composed of non crystalline and medium ordered phases. Although these two minerals are mainly composed of non crystalline phase and have the similar short range structure models, they still have the differences in the linkage form of adjacent octahedrals[AlO 6] and in the linkage ordering of adjacent tetrahedrals[MO 4]. In addition, the size of crystalline or order phase in the two minerals and the structure changes with temperature are also different.