Table 3. Isotropic Bulk Modulus B (GPa), Shear Modulus G (GPa), Young’s Modulus E (GPa), the Poisson’s Ratio ν, Longitudinal ν_L (m/s), Transverse ν_T (m/s), Average Sound Velocity ν_M (m/s), and Debye Temperature θ_D (K) for Cs₂AgBiCl₆ and Cs₂AgBiBr₆ Polymorphs.

		Cs2AgBiCl6			Cs2AgBiBr6
phase		this work	experiments	other calculations	this work	experiments	other calculations
Fm3̅m	BV	29.48		2.30a	20.97		2.41a
	BR	29.48			20.97
	B	29.48			20.97
	GV	10.19			7.51
	GR	9.64			7.42
	G	9.91			7.46
	B/G	2.97			2.81
	E	26.75			20.01
	ν	0.349			0.341
	νL	3183			2572
	νT	1534			1264
	νM	1724			1419
	θD	163			126

^aRef (43).