OPTICAL
	Transmission Range	0.4 to 30 microns
	Refractive Index	2.1723 at 11 microns
	Reflection Loss	25.4% at 11 µm (2 surfaces)
	Restrahlen Peak	91.5 microns
	dN/dT
	dN/dµ = 0	5.5 microns
PHYSICAL
	Density	7.18 g/cm3
	Melting Point	423°C
	Thermal Conductivity	0.7 W/(m? K) at 329K
	Thermal Expansion	50? 10-6/°C
	Hardness	Knoop 29.9 with 500g indenter
	Specific Heat Capacity	188 J/(kg? K)
	Dielectric Constant	32 at 1MHz
	Young's Modulus (E)	20.68 GPa
	Shear Modulus (G)	8.48 GPa
	Bulk Modulus (K)	22.81 GPa
	Elastic Coefficients	C11 = 38.5 C12 = 14.9 C44 = 7.37
	Apparent Elastic Limit	20.7 MPa (3000psi)
	Poisson Ratio	0.219
CHEMICAL
	Solubility	0.3g/100g water at 20°C
	Molecular Weight	40 mole % TlBr: 60 mole % TlCl
	Class/Structure	Cubic, CsCl structure, Pm3m, no cleavage planes

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