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You are here: Home / Chloride Crystal / KCl

Potassium Chloride (KCl) is hygrosopic. The crystal often applied for infared transmission windows and FTIR spectrophotometers. The KCl windows have low refractive index and high threshold damage. So it’s very useful for sputter barrier windows in CO2 lasers. KCl single crystal uniform texture and transparent, has a high infrared transmittance, the transmittance greater than 90% when thickness less 10mm and in the range of 4000-500cm-1, no impurity absorption. KCI single crystal as a laser window material, the optical performance is excellent.

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Parameter

Material and Specifications
Orientation<100>, <110>, <111>
Orientation Tolerance< 0.5°
Parallelism5〞
Perpendicularity3ˊ
Surface Quality10-5 (Scratch/Dig)
Wavefront Distortion<λ/4@632 nm
Surface Flatness<λ/8 @632 nm
Clear Aperture>90%
Chamfer<0.1×45°
Thickness/Diameter Tolerance±0.05 mm
Physical and Chemical Properties
Crystal StructureCubic
Symmetry Classm3m
Lattice Constants6.291 Å
Density1.989 g/cm3
Melting Point776°C
Cleavability(100), perfect
Thermal Conductivity /(W·m-1·K-1)@46°C6.53
Specific Heat (J·kg-1·K-1)690
Thermal Expansion(10-6·K-1@60°C)34.1 … 38.3
Hardness (Knoop)7.2@<110>, 9.3@<100>
Vickers Microhardness (GPa)0.15
Young’s Modulus (GPa)16.8@<110>, 38.2@<100>
Shear Modulus (GPa)6.3@<110>, 10.8@<100>
Bulk Modulus (GPa)17.36
Rupture Modulus (GPa)4.41×10-3
Elastic Coefficient (GPa)C11=40.2, C12=6.7, C44=6.29
Optical Characteristics
Transmission Range0.21 … 30µm  
Refractive Index1.488@0.6µm, 1.454@10.6µm
Reflective Loss6.8%@10.0µm
Reststrahlen63.1µm
Poisson Ratio0.134
Index of Refraction
λ(μm)nλ(μm)nλ(μm)n
0.21.71751.4703111.4527
0.51.496861.4683121.4463
11.479671.465912.51.446
21.475181.4632151.4325
31.473591.4601201.3947
41.472101.4566301.2626
Spectrum

Feature
Application
Literature
Feature
  • Wide-band good conductor
  • Water-soluble, easy to deliquesce and cannot be chemically polished
  • Can grow epitaxial films on a featureless substrate
Application
  • Substrate for Epitaxial growth
  • Be used in the production of infrared spectroscopy analyzer
  • Ultraviolet and infrared optical components
  • Prisms, lenses, filters and various laser windows, infrared devices, optical, laser crystal instruments
  • IR spectroscopy
  • Windows for CO2lasers
  • Protection windows for cutting lenses
Literature
Adsorption and regeneration of expanded graphite modified by CTAB- KBr/H 3 PO 4 for marine oil pollution
Electrolytic coloration and spectral properties of OH ? -doped KBr polycrystals
Measurements and calculations of solid–liquid equilibria in the quaternary system NaBr–KBr–Na 2 SO 4 –K 2 SO 4 –H 2 O at 298 K
Structural and optical characterisation of ZnO nanocrystals embedded in bulk KBr single crystal
Mechanism enabling the observation of the formally optically-forbidden 2A ?gand 1B ?u states in resonance-Raman excitation profiles of spheroidene in KBr disc
Analysis of GRACE range-rate residuals with focus on KBR instrument system noise
Supercontinuum generation in the absence and in the presence of color centers in NaCl and KBr
Reaction-induced porosity fingering: Replacement dynamic and porosity evolution in the KBr-KCl system
Production and use of radioactive [ 82 Br]KBr in high-temperature corrosion studies
Optical and structural characterization of KBr crystals doped cadmium bromide (CdBr 2 )

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