OPTICAL
	Transmission Range	0.17 to 5.5 microns
	Refractive Index	1.75449 (o) 1.74663 (e) at 1.06 microns
	Reflection Loss	at 1.06 µm (2 surfaces) for o-ray – 11.7%; for e-ray – 14.2%
	Index of Absorption	0.3 x 10-3 cm-1 at 2.4µm
	Restrahlen Peak	13.5µm
	dN/dT	13.7 x 10-6 at 5.4µm
	dN/dµ = 0	1.5µm
PHYSICAL
	Density	3.97 g/cm3
	Melting Point	2040°C
	Thermal Conductivity	27.21 W/(m? K) at 300K
	Thermal Expansion	5.6 (paral) & 5.0 (perp) x 10-6/K
	Hardness	Knoop 2000 with 2000g indenter
	Specific Heat Capacity	419 J/(kg? K)
	Dielectric Constant	11.5 (paral) 9.4 (perp) at 1MHz
	Young's Modulus (E)	335 GPa
	Shear Modulus (G)	148.1 GPa
	Bulk Modulus (K)	240 GPa
	Elastic Coefficients	C11=496 C12=164 C13=115 C33=498 C44=148
	Apparent Elastic Limit	275 MPa (40,000 psi)
	Poisson Ratio	0.25
CHEMICAL
	Solubility	98? 10-6 g/100g water
	Molecular Weight	101.96
	Class/Structure	Trigonal (hex), R3c

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