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MgF2 crystal substrate

It is widely used in ultra violet window, flat mirror and prism, infrared optical elements.
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Structure	Tetragonal
Lattice Constant	a = 4.64 c=3.06
M.P(^oC)	1255
Density(g/cm³)	3.18
Hardness	6
CTE(^oC^-1x 10^-6)	13.7
Refractive index	h_o1.37740 h_e1.38945
trans-band (microns)	0.11 - 7.5
Transmittance	>93% @5μm >85% @ 0.2μm
Color difference(H_f-H_c)	_0.00355
Temperature Coefficient( dh / dt x 10^-6)	2.3 ~1.7 @ 0.4 m
Method of crystal growth	Bridgeman