KRs-5
(TlBr-TlI)
is a gorgeous red crystal
commonly used for attenuated total reflection prisms
for IR spectroscopy. It
is also used as an infrared transmission window in gas and liquid sample cells used with FTIR spectrophotometers in place of Potassium
Bromide (KBr) or Cesium Iodide (CsI) for analysis of aqueous
samples that would attack KBr or CsI optics.
It has a wide transmission range and is virtually
insoluble in water. It is a useful alternative to AgCl since it is
not photo-sensitive and for ATR applications
it will transmit
well beyond the 18
micron useful range of ZnSe.
KRS-5 is considered toxic, but in our opinion it
is safe for IR spectroscopic applications when properly
handled.
Optical Properties--
KRS-5 Optical Crystals
Transmission
Range: 0.6 to 32µm
Refractive
Index: 2.37
at 10µm
Reflection
Loss: 28.4% at 10µm
( 2 surfaces)
Physical
Properties-- KRS-5 Optical Crystals
Melting
Point: 414.5° C
Young's
Modulus: 15.85 GPa
Apparent
Elastic Limit: 3800 psi
Structure:
Cubic, no cleavage, CsCl structure
Chemical
Properties - KRS-5 Optical Crystals
Solubility:
0.05gm/100gm H2O @ 20°
C
