crystaltechno : crystal optics manufacturer


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE

Tallium Bromide-Iodide (KRS-5)

KRS-5 is used for attenuated total reflection prisms, IR windows and lenses where transmission in the 0.6 µm - 40 µm range is desired. It has a tendency to cold-flow and change its shape with time. KRS-5 is only slightly soluble in water but can be dissolved in alcohol, nitric acid, and aqua regia. This material is considered toxic and should be handled with care.

Maximum available size:
200 mm Dia x 60 mm Thk


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE




	PARAMETER	VALUE

OPTICAL
	Transmission Range	0.6 to 40 microns
	Refractive Index	2.37069 at 10 microns
	Reflection Loss	30,3% at 10 µm (2 surfaces)
	Restrahlen Peak	135 microns
	dN/dT	-235 X 10-6/°C
PHYSICAL
	Density	7.371 g/cm³
	Melting Point	414.5°C
	Thermal Conductivity	0.544W/(m*K) at 20°C
	Thermal Expansion	58? 10^-6/°C
	Hardness	Knoop 40.2 kg/mm²
	Specific Heat Capacity	200 J/(kg? K) at 0°C
	Dielectric Constant	32.5
	Young's Modulus (E)	15.85 GPa
	Shear Modulus (G)	5.79 GPa
	Bulk Modulus (K)	19.78 GPa
	Elastic Coefficients	C₁₁ = 33.1 C₁₂ = 13.2 C₄₄ = 5.79
	Apparent Elastic Limit	26.2 MPa
	Poisson Ratio	0.369
CHEMICAL
	Solubility	0.05g/100g water at 20°C
	Molecular Weight	42 mole % TlBr: 58 mole % TlI
	Class/Structure	Cubic, CsCl structure. No cleavage planes


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE

Wavelength, µm	0.540	1.000	1.500	2.000	3.000	4.000	5.000	6.000	7.000
Refractive Index	2.681	2.446	2.408	2.395	2.386	2.382	2.380	2.378	2.376

Wavelength, µm	8.000	9.000	10.00	11.00	12.00	13.00	14.00	15.00	16.00
Refractive Index	2.375	2.373	2.371	2.369	2.366	2.364	2.361	2.358	2.355

Wavelength, µm	17.00	18.00	19.00	20.00	21.00	22.00	23.00	24.00	25.00
Refractive Index	2.352	2.348	2.345	2.341	2.336	2.332	2.327	2.323	2.318

Wavelength, µm	26.00	27.00	28.00	29.00	30.00	31.00	32.00	33.00
Refractive Index	2.312	2.307	2.301	2.295	2.289	2.282	2.275	2.268

Wavelength, µm	34.00	35.00	36.00	37.00	38.00	39.00	40.00
Refractive Index	2.261	2.253	2.245	2.237	2.228	2.220	2.210