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Sodium Fluoride (NaF)

 ♦ Sodium Fluoride (NaF) Data Sheet     ♦ Sodium Fluoride (NaF) MSDS

Sodium Fluoride has the lowest refractive index of all common optical materials which makes it of interest as a Cerenkov radiator in Particle Physics research. Crystran Ltd. has supplied Sodium Fluoride material which has been made into large arrays at CERN and it is used in Ring Imaging Cerenkov Counters (RICH).

Transmission Range :0.14 to 11 μm
Refractive Index :1.3255 at 0.6 μm
Reflection Loss :3.9% at 0.6 μm
Absorption Coefficient :1 x 10-3 cm-1 at 7 μm @ 300K (1)
Reststrahlen Peak :35.8 μm
dn/dT :-13 x 10-6 /°C at 293K
dn/dμ = 0 :1.7 μm
Density :2.79 g/cc @20°C
Melting Point :980°C
Thermal Conductivity :3.746 W m-1 K-1 at 273K
Thermal Expansion :36 x 10-6 /K at 300K
Hardness :Knoop 60 in <100>
Specific Heat Capacity :1088 J Kg-1 K-1
Dielectric Constant :6 at 1 MHz
Youngs Modulus (E) :79.01 GPa
Shear Modulus (G) :12.70 GPa
Bulk Modulus (K) :47.9 GPa
Elastic Coefficients :C11=79.01; C12=12.7; C44=47.9
Apparent Elastic Limit :2.4 MPa (estimated)
Poisson Ratio :0.326
Solubility :4.22g/100g water at 18°C
Molecular Weight :42.0
Class/Structure :Cubic FCC, NaCl, Fm3m, (100) cleavage

To download this data or our MSDS safety data sheet as a pdf, please click on the links at the top of the page.  To expand the transmission graphs, please click on the image.
µm   Noµm   Noµm   No
0.140   1.550.145   1.4990.161   1.438
0.175   1.4100.186   1.3930.199   1.3805
0.203   1.37720.302   1.342320.405   1.33194
0.486   1.328180.546   1.32640.589   1.32549
0.707   1.323720.811   1.322720.912   1.32198
1.014   1.32152.000   1.31703.100   1.313
4.100   1.3085.100   1.3016.100   1.292
7.100   1.2818.100   1.2699.100   1.252
10.30   1.23311.30   1.20912.50   1.18
13.80   1.14215.10   1.09316.70   1.029

Sodium Fluoride is produced by vacuum Stockbarger techniques. The Sodium Fluoride is very difficult to anneal and cleaves readily limiting the useful size of pieces to about 80mm. Sodium Fluoride polishes well but must be kept in dry air to maintain the quality of the surfaces and retain the deep UV transmission needed for Cerenkov radiation from this material.

REFERENCES:
(1) H.H.Li, Absorption Coefficients, Int.J.Therm, V1, No. I, 1980