α_L~'—C_2S中可能的一种双晶畴结构

A POSSIBLE TWIN DOMAIN STRUCTURE OF α_L'-Ca_2SiO_4

根据晶畴结构的群论原理,对Ca_2SiO_4的α′_H→α′_L相变所导致的畴结构类型进行了推导。通过把α′_H-C_2S的空间群Pcmn相对于α′_L-C_2S的空间群Pnm2_1的陪集展开可以得知,α′_H→α′_L相变导致在α′_L-C_2S中形成倒反双晶畴结构,且双晶畴与α′_H-C_2S母相的结晶学取向关系为a′_(a_L)∥b′_(a_H),b′_(a_H)∥c′_(a_H),c_(a_L)∥a′_(a_H)。

Based on the group theory of domain structure, the type of the domain structure resulting from transformation of α_H'-Ca_2SiO_4 into α_L'-CaSiO_4 are determined. By decomposing Pcmn, the space group of α_H'-Ca_2SiO_4, with respect to Pna2_1,the space group of α_L'-Ca_2SiO_4,it is deduced that the transformation of Pcmn into Pna2_1 results in the inversion twin domain structure, and the crystallographic relationship between α_H'-Ca_2SiO_4 parent phase and α_L'-Ca_2SiO_4 domain is:a_(α_L)'//b_(α_H)';b_(α_L)'//c_(α_H)';c_(α_L)'//a_(α_H)'.