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Product Announcement

SrF2 Crystal

18 Dec 2020

Strontium Fluoride (SrF2) is one of the most important alkaline-earth fluorides. It has many physical properties, such as low energy phonon, high ionization, high resistance coefficient and good anion conductivity. It has been widely used in light-emitting devices, optical imaging, biomarkers, anion conductors and other fields. Compared with oxide and calcium fluoride, strontium fluoride has lower phonon energy, higher thermal conductivity and negative thermal optical coefficient, especially negative thermal optical coefficient, which can compensate the thermal lens effect in the process of laser oscillation. Strontium fluoride has promoted the research of optical materials and the improvement of optical instruments with its unique material structure and properties


Physical and Chemical Properties

Crystal Structure Single crystal, synthetic
Crystal Type Cubic (CaF2 type)
Lattice Constants 5.7996
Density 4.24 g/cm3
Melting Point 1477°C
Thermal Conductivity /(W·m-1·K-1@298k) 1.42
Specific Heat Capacity/ (J·kg-1·K-1) 544
Thermal Expansion /(10-6·K-1@293k ) 18.4
Hardness (Mohs) 130
Young`s Modulus /(GPa) 99.91
Shear Modulus /(GPa) 34.6
Bulk Modulus /(GPa) 24.65
Elastic Coefficient/(GPa) C11=124; C12=44; C44= 31.8
Cleavage -111
Solubility in Water/(g/100g) 0.021@298K

Optical characteristics

Transmission Range (50%) 0.14 … 9µm @thickness 2mm  
Refractive Index   1.436914@633nm 
Reflective Loss  1.74% @10 µm  
Poisson Ratio 0.29
Dielectric Constant 7.69@2MHz
Reststrahlen 40µm

Index of Refraction



  • Poorly soluble in water, ethanol and methanol
  • High conductivity and optical properties similar to calcium fluoride
  • Can transmit ultraviolet and infrared waves
  • Very dangerous to the health, poisonous when inhaled or ingested and in low concentration can cause irritation to skin and eyes.
  • Not flammable


  • UV and VUV spectroscopy
  • Manufacture optical materials for different devices, like glasses, windows and lenses
  • Intermediate infrared laser matrix material

Nanjing Crylink Photonics Co.,Ltd
No.3, Hengda Road, Economic and Technological Development Zone, Nanjing, China
No.200,Zhaoxian Road,Jiading District,Shanghai City
Tel: (86)025-68790684
Fax: (86)025-68790685
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