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Lithium Bromide
Crystal:
Structure: NaCl
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Lattice formation energy: |
-8.23 eV. |
Lattice parameter: |
2.74 Å (2.73 at 0K.) |
Density: g/cm3 |
|
Stiffness constants
c11: 3.959 or 4.721 (Ref.1)
c12: 1.909 or 1.590
c44: 1.909 or 2.052
Compressibility (in 1011 dynes/cm2): 0.385 ??
Poisson ratio:
Debye temperature: 242-257 K (see Ref.2)
Melting temperature: K
Phonon spectrum discussed by:
Transverse optic phonon T0 (k=0): 159 or 187 cm-1
Longitude optic phonon L0 (k=0): cm-1
Gruneissen constant:
Ratio e*/e:
Photoelastic constants:
p11:
p12:
p44:
Electronic band structure of the alkali halides. II: Critical survey of theoretical calculation,
R.T. Poole, J. Liesegang, R.C.G. Leckey & J.G. Jenkin, Phys.Rev. B12, 5194 (1975) give:Valence band width: 4.8 eV.
Gap: 7.6 eV.
Electron affinity: 0.2 eV.
Band gap:
direct: eV. at K
indirect: eV. at ° K
Plasmon energy:
Exciton energy: 7.23 eV. (Ref.3)
Band structure discussed by:
A.B. Kunz, Self-consistant local orbitals for Lithium Halide Crystals, Phys.Rev. B2, 2224 (1970)
Static dielectric constant: 12.1 or 13.2 (11.95 at 0K.)
Optic dielectric constant: 3.16 or 3.2 (3.22 at 0K.)
Electron mobility:
Hole mobility:
Polaron coupling constant: a = 3.5 ( for m*=1 )
Effective mass: conduction band:
valence band:
Electron affinity: ( in eV., from bottom of conduction band under vacuum)
3.52 (by Mott-Gurney, probably 3eV. too high) (Ref.4
Spin-orbit coupling: 0.52 ( valence band) (Ref.5)
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References:
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