Table 3.

Calculated elastic constants C_ij (GPa) and Cauchy pressure C₁₂ − C₄₄ (GPa) of AGeF₃ (A = K, Rb) at various applied pressures.

Pressure (GPa)	Compound	C11	C12	C44	C12 − C44
031	KGeF3	80.67	35.57	5.96	29.61
	RbGeF3	82.61	34.28	12.53	21.75
0	KGeF3	93.66	30.17	13.07	17.10
	RbGeF3	91.35	33.25	16.53	16.72
10	KGeF3	165.95	52.47	10.22	42.25
	RbGeF3	163.40	57.57	16.45	41.12
20	KGeF3	233.93	77.25	6.66	70.59
	RbGeF3	227.88	81.06	15.51	65.55
30	KGeF3	293.88	98.42	2.51	95.91
	RbGeF3	292.15	107.79	13.99	93.80