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Strontium Oxide
Crystal: SrO
Structure: NaCl
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Cohesive energy: |
eV |
Lattice parameter: |
2.57 Å |
Density: |
4.7 or 4.99 g/cm3 |
Stiffness constants: in 1011 dynes/cm2, at room temperature
c11: 16.55 (Ref.1), or 16.27 (Ref.2), or 17.76 (Ref.3)
c12: 4.64 or 5.07 or 4.13
c44: 5.26 or 6.4 or 5.95
P dependance for stiffness constants:
Z. Chang, E.K. Graham, Elastic properties of oxides in the NaCl-Structure, J. Phys. Chem. Sol. 38, 1355 (1977)
Compressibility (in 1011 dynes/cm2): 0.116 ??
Poisson’s ratio: 0.21 (Voigt), or 0.39 (Reuss)
Debye temperature: 306 K
Melting temperature: 2430 or 2415 ° C
Phonon spectrum discussed by: Mon, Phys.Stat.Sol.33, 1068 (1969)
Also: Neutron Data:K.H. Rieder, R. Migoui and B. Renker, Lattice dynamics of Strontium Oxide, Phys. Rev. B12, 3374 (1975)
Transverse optic phonon T0 (k=0): 4.01*10exp13/sec., or 227 cm-1 (Ref.4)
Longitude optic phonon L0 (k=0): 487 and 473 cm-1 cited in Ref.4 (445 by LST)
Gruneissen constant:
Ratio e*/e:
Photoelastic constants:
p11:
p12:
p44:
Band gap: direct: 6.7 eV. cited by Hendeson & Hughes, 5.45 eV cited by Bessent , 5.30 eV. (Ref.6)
First excitation: 5.81 eV. (Ref.6)
Valence band width: 9.2 eV. (?)
Excitons in BaO, SrO: (A.S. Rao, R.T. Keamey, Phys.Stat.Sol. 95, 243 (1979))
Includes such band data as Gamma Gap:
MgO |
CaO |
SrO |
BaO |
7.833 |
7,085 |
5.896 |
4.286 eV |
26 |
34 |
74 |
120 meV |
Band structure discussed by:
Static dielectric constant: 13.3, or 13.10±0.04 (Ref.7)
Optic dielectric constant: 3.31, or 3.46±0.04
Electron mobility: Hole mobility:
Polaron coupling constant:
Effective mass: conduction band
valence band:
Electron affinity: (from bottom of conduction band under vacuum) ~0.5 eV (Ref.8)
Spin-orbit coupling: ( valence band)
Cation polarisation: 0.860 Å-1 Anion polarisation: 2.568 Å-1
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References:
1. Comptes Rendus B269, 30 (1969)
2. R.A. Bartels and R. Son CaO and SrO single crystal elastic constants and their pressure dependence, Bull. Am. Phys. Soc. 16, 357 (1971)
3. D.L. Johnson, H. Thrasher, R.J. Kearney, Elastic constants of SrO, J. Appl. Phys. 41, 427 (1970)
4. J.L. Jacobson and E.R. Nixon, Infrared dielectric response and lattice vibrations of Calcium and Strontium Oxides, J. Phys. Chem. Sol. 29, 967 (1968)
6. B. Ulrici, W. Ulrici, N.N. Kovalev, Optical absorption in SrO single crystals, Sov. Phys. Sol. St. 17, 2305 (1976)
7. J.L. Jacobson and E.R. Nixon, Infrared dielectric response and lattice vibrations of Calcium and Strontium Oxides, J.Phys.Chem.Sol. 29, 967 (1968)
8. S. 60, 13 (1948)
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