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Sodium Iodide
Crystal:
NaIStructure: NaCl
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Lattice formation energy: |
-7.08 eV. |
Lattice parameter: |
3.23 Å (3.194 at 0K.) |
Density: |
g/cm3 |
Stiffness constants: in 1011 dynes/cm2, at room temperature
c11: 3.59 (Ref.1) |
or 3.761 |
c12: 0.75 |
or 0.798 |
c44: 0.768 |
or 0.781 |
Compressibility (in 1011 dynes/cm2): 0.589
Poisson ratio:
Debye temperature: 165 K
Melting temperature: K
Phonon spectrum discussed by:
A.D.B Woods, W. Cochran & B.N. Brockhouse, Lattice dynamics of alkali halide crystals, Phys.Rev. 119, 980 (1960)
And: A.D.B.Woods,B.N. Brockhouse & R.A. Cowley, Lattice dynamics of alkali halide crystals.II: Studies of KBr & NaI, Phys. Rev. 131, 1025 (1963)
Transverse optic phonon T0 (k=0): 113.5 or 124 cm-1
Longitude optic phonon L0 (k=0): cm-1
Gruneissen constant:
Ratio e*/e: 0.71
Photoelastic constants:
p11:
p12:
p44:
Band gap:
direct: 5.8 eV. at K
indirect: eV. at ° K
Plasmon energy: eV.
Exciton energy: 5.61 eV. (Ref.2)
Conduction band width: 1.5eV.
Band structure discussed by:
Static dielectric constant: 6.60 or 6.62
Optic dielectric constant: 2.91 or 3.08
Electron mobility:
Hole mobility:
Polaron coupling constant:
Effective mass: conduction band:
valence band:
Electron affinity: ( in eV., from bottom of conduction band under vacuum)
3.21, by Mott-Gurney, perhaps 3eV. too high (Ref.3)
Spin-orbit coupling: 1.17 ( valence band) (Ref.4)
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Other information:
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References:
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