Question

Why is conductivity isotropic in a plane perpendicular to the z-axis of a tetragonal crystal?

Answer 1

In quartz, perpendicular to the c-axis, the thermal conductivity is 6.5 ..... In the temperature range 0ºC to 120ºC, BaTiO3 is tetragonal.

it increases the speed of the axis none of the other speed is being speaded up the rays.

Answer 2

Explanation:

Tetragonal One 4-fold Trigonal One 3-fold Hexagonal One 6-fold Cubic Four 3-folds 1 1 2,m 2m 4, 422, 4, 4mm, 42m mmm 222,mm2 m,4 mmm 3,32,3m,3 m 6, 622, 6, 6mm, 6m2.