Table 1.

Goldschmidt tolerance factor (t) of various perovskite materials5

Goldshmidt tolerance factor (t)	Structure	Example
0.9–1.0	Cubic	SrTiO3,6 BaTiO3 7
0.71–0.9	Several perovskite structures/orthorhombic rhombohedral	GdFeO3, CaTiO3 6
<0.71	Ilmenite	FeTiO3,5 KNbO3 5
>1	Hexagonal or tetragonal	BaNiO3 6