Structural and Optical Properties of Calcium Titanate Prepared from Gypsum

Table 2

Crystallographic parameters of different materials.

Material	Crystal system	Space group	Space group number
Gypsum	Monoclinic	12/a	15	5.6	6.51	1.16	90	118.4
CaSO4	Orthorhombic	Bmmb	63	6.992	6.24	0.89	90	90
Ca(OH)2	Orthorhombic	Bmmb	136	4.58	2.95	0.69	90	90
CaTiO3 (900°C)	Orthorhombic	Pbnm	136	4.58	2.95	0.46	90	90
CaTiO3 (1000°C)	Cubic	Im-3m	229	4.47	4.47	1	90	90