crystaltechno : crystal optics manufacturer


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE

Tallium Bromide (KRS-6)

KRS-6 crystals by sealed ampoule Stockbarger technique. Starting materials of the highest purity are selected to ensure that there are no anionic absorption bands between 2 and 16 microns and all crystals are checked for quality by using a pathlength of 120mm. Thallium salts are toxic, and KRS-6 has enough solubility to require extreme caution. Careful handling with plastic gloves covered with soft cotton gloves as appropriate to delicate optics is required. KRS-6 is used for IR windows and lenses where transmission in the 0.4 µm - 32 µm range is desired. This material is considered toxic and should be handled with care.

Maximum available size:
300 mm Dia x 50 mm Thk


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE




	PARAMETER	VALUE

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


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE

Wavelength, µm	0.6	0.7	0.8	0.9	1.0	1.1	1.2	1.3	1.4
Refractive Index	2.329	2.298	2.266	2.251	2.240	2.232	2.225	2.221	2.219

Wavelength, µm	1.5	1.6	1.7	1.8	1.9	2	2.2	2.4	2.6
Refractive Index	2.215	2.212	2.210	2.209	2.207	2.206	2.204	2.202	2.201

Wavelength, µm	2.8	3	3.5	4	4.5	5	6	7	8
Refractive Index	2.200	2.199	2.197	2.196	2.194	2.194	2.190	2.187	2.184

Wavelength, µm	9	10	11	12	13	14	15	16
Refractive Index	2.180	2.178	2.172	2.167	2.162	2.156	2.150	2.144

Wavelength, µm	17	18	19	20	21	22	23	24
Refractive Index	2.138	2.131	2.124	2.115	2.107	2.098	2.088	2.075