The Propagation of Thermoelastic Waves in Anisotropic Media of Orthorhombic, Hexagonal, and Tetragonal Syngonies

Table 1

Crystal system	Characteristic symmetry	Syngony	Unit cell parameters	Independent parameters
Triclinic	1x 1-fold	-1	;	6
Monoclinic	1x 2-fold	2/m	; ;	4
Orthorhombic	x 2-fold	mmm	;	3
Tetragonal	1x 4-fold	4/mmm	;	2
Trigonal	1x 3-fold	6/mmm (P)	; ;	2
		-3m (R)
Hexagonal	1x 6-fold	6/mmm	; ;	2
Cubic	4x 3-fold	m-3m	;	1