Crystal structure study of (Ca,Gd)(2)(Al,Ti)O-4

摘要

The crystal structures of two crystals of (Ca, Gd)(2)(Al, Ti)O-4 [tetragonal I4/mmm; Z = 4], one strongly fluorescent and the other weakly fluorescent, having minor differences in their precise compositions have been studied with single-crystal X-ray diffraction methods. The unit cell is significantly smaller for the weakly fluorescent crystal, which also shows alteration of the coordination polyhedron around the (Ca, Gd) site, suggesting the formation of vacancies at an oxygen site. (C) 1998 Academic Press. [References: 9]