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Cesium Fluoride
Crystal: CsF

Structure: NaCl

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Mechanical and structural properties:

Stiffness constants: in 10¹¹ dynes/cm², at room temperature

c₁₁: 4.6

c₁₂: 1.6

c₄₄: 0.8

Compressibility (in 10¹¹ dynes/cm²):

Poisson ratio:

Debye temperature: K

Melting temperature: K

Phonon spectrum discussed by:

J.R. Hardy & A.M. Karo, Lattice dynamics & second-order Raman spectrum of CsF, Phys. Rev. 168, 980 (1968)

Also: For neutron data:

S. Rolandson, Lattice dynamics of Cesium Fluoride Phys.Stat.Sol. 52, 643 (1972)

Transverse optic phonon T0 (k=0): cm^-1

Longitude optic phonon L0 (k=0): cm^-1

Gruneissen constant:

Ratio e*/e:

Photoelastic constants:

p₁₁:

p₁₂:

p₄₄:

Electronic properties:

Band gap:

direct: eV. at K

indirect: eV. at ° K

Plasmon energy: eV.

Exciton energy: eV.

Valence band width: 2.9 eV.

Band structure discussed by:

Static dielectric constant: 7.90 (Ref.2)

Optic dielectric constant:

Electron mobility:

Hole mobility:

Polaron coupling constant: a = ( for m*=1 )

Effective mass: conduction band:

valence band:

Electron affinity: ( in eV., from bottom of conduction band under vacuum)

Spin-orbit coupling: ( valence band)

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References:

C. Kittel, "Introduction to Solid State Physics", 2nd. Edition, New York: Wiley (19 )

J.R. Hardy & A.M. Karo, Lattice dynamics & second-order Raman spectrum of CsF, Phys. Rev. 168, 1054 (1968)

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