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Hafnium Dioxide
Crystal:
HfO2 + 10% Y2O3Structure: cubic
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Cohesive energy: |
eV |
Lattice parameter: |
2.22 Å (nn distance) |
Density: |
g/cm3 |
Stiffness constants: in 1011 dynes/cm2, at room temperature
c11: 38.2 (Ref.1)
c12: 10.8
c44: 6.0
Compressibility (in 1011 dynes/cm2): 0.050 ??
Poisson ratio:
Debye temperature: K
Melting temperature: 2780 ° C
Neel temperature: K
Phonon spectrum discussed by:E. Anstassakis, B. Papanicolaon, T.M. Asher, Lattice dynamics and light scattering in Hafnia and Zirconia,, J. Phys. Chem. Sol. 36, 667 (1975)
Optic waves:
Transverse optic phonon T0 (k=0): cm-1
Longitude optic phonon L0 (k=0): cm-1
Gruneissen constant:
Ratio e*/e:
Elastic properties of Eu2O3-HfO2: microfiche IS-T-807
Also: S.L. Dole, O. Hunter, J.R. and F.W. Calderwood, Elastic properties of stabilised HfO2 compositions, J. Am. Ceram. Soc. 63, 136 (1980)
Elastic/lattice properties for monoclinic form:
S.L. Dole, O. Hunter, J.R. and C.J. Wooge, Elastic properties of monoclinic Hafnium oxide at room temperature, J. Am. Ceram. Soc. 60, 488 (1977)
Photoelastic constants:
p11:
p12:
p44:
Band gap:
direct: 5.5 eV. (Ref.2)
indirect:15.7 eV. (plasmon?) (Ref.2)
Gap: eV.
First exciton: eV.
Band structure discussed by:
Static dielectric constant:
Optic dielectric constant: 4.93
Electron mobility:
Hole mobility:
Polaron coupling constant:
Effective mass:
conduction band:
valence band:
Electron affinity: (in eV., from bottom of conduction band under vacuum)
Spin-orbit coupling: (valence band)
Cation polarisation: Å-3
Anion polarisation: Å-3
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Other information:
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References:
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