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

c₁₁: 7.570 (7.585 at 4K.) (Ref.1)

c₁₂: 1.35 (1.473 at 4K.)

c₄₄: 1.336 (1.293 at 4K.)

Compressibility (in 10¹¹ dynes/cm²): 0.292 ??

Poisson ratio:

Debye temperature: 327 or 335 K

Melting temperature: K

Phonon spectrum discussed by:

W. Burher, Lattice dynamics of Potassium Fluoride Phys. Stat. Sol. 41, 789 (1970)

Transverse optic phonon T0 (k=0): 190 or 201.5 cm^-1

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

Gruneissen constant:

Ratio e*/e:

Photoelastic constants:

p₁₁:

p₁₂:

p₄₄:

Band gap:

direct: eV. at K

indirect: eV. at ° K

Plasmon energy: 17.5 eV. (Ref.2)

Exciton energy:

10.6 eV. (Ref.2)

9.58 eV. (Ref.3)

Valence band width: 3.70 eV.

Band structure discussed by:

Static dielectric constant: 6.05 or 5.11

Optic dielectric constant: 1.85 or 1.86

Electron mobility:

Hole mobility:

Effective mass:

conduction band:

valence band:

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

0.1 (Ref.3)

4.14, by Mott-Gurney (Ref.4)

Spin-orbit coupling: ( valence band)