Table 4.

The calculated bulk modulus B (GPa), shear modulus G (GPa), Young’s modulus E (GPa), Poisson’s ratio v, Pugh’s ratio B/G, and Zener anisotropy index A of AGeF₃ (A = K, Rb) at various applied pressures.

Pressure (GPa)	Compound	B	G	E	B/G	v	A
031	KGeF3	50.61	10.52	29.53	4.81	0.40	0.26
	RbGeF3	50.39	16.35	44.27	3.08	0.35	0.52
0	KGeF3	51.34	18.81	50.30	2.73	0.366	0.412
	RbGeF3	52.62	20.76	55.03	2.49	0.326	0.569
10	KGeF3	90.30	22.01	61.08	4.10	0.387	0.180
	RbGeF3	92.97	26.85	73.47	3.46	0.368	0.311
20	KGeF3	129.4	22.92	64.93	5.65	0.416	0.085
	RbGeF3	130.00	30.67	85.29	4.24	0.391	0.211
30	KGeF3	163.57	22.35	64.14	7.32	0.434	0.026
	RbGeF3	169.24	33.22	93.55	5.09	0.407	0.152