Abstract
A simple relation between zone-centre optical phonon modes and elastic constants for hcp metals derived previously from lattice dynamical force constant models using central and angular interactions is found to be reasonably valid for elemental metals with low elastic anisotropy. Application of this formalism to high-pressure phonon frequency data implies that phase transitions from hcp to Sm-type and to the ω-phase in the regular lanthanides and Zr, respectively, involve softening of the elastic constant C44, and that the rapid decrease under compression of an `unusual' high ambient-pressure TO mode Gruneisen parameter in Zn is related to the gradual transition from anisotropic→isotropic compressional behaviour with increasing pressure.
| Original language | English |
|---|---|
| Pages (from-to) | 335-339 |
| Number of pages | 5 |
| Journal | Solid State Communications |
| Volume | 115 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - Jul 4 2000 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
Cite this
Optical zone-centre phonon modes and macroscopic elasticity in hcp metals. / Olijnyk, H.; Jephcoat, A. P.
In: Solid State Communications, Vol. 115, No. 7, 04.07.2000, p. 335-339.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Optical zone-centre phonon modes and macroscopic elasticity in hcp metals
AU - Olijnyk, H.
AU - Jephcoat, A. P.
PY - 2000/7/4
Y1 - 2000/7/4
N2 - A simple relation between zone-centre optical phonon modes and elastic constants for hcp metals derived previously from lattice dynamical force constant models using central and angular interactions is found to be reasonably valid for elemental metals with low elastic anisotropy. Application of this formalism to high-pressure phonon frequency data implies that phase transitions from hcp to Sm-type and to the ω-phase in the regular lanthanides and Zr, respectively, involve softening of the elastic constant C44, and that the rapid decrease under compression of an `unusual' high ambient-pressure TO mode Gruneisen parameter in Zn is related to the gradual transition from anisotropic→isotropic compressional behaviour with increasing pressure.
AB - A simple relation between zone-centre optical phonon modes and elastic constants for hcp metals derived previously from lattice dynamical force constant models using central and angular interactions is found to be reasonably valid for elemental metals with low elastic anisotropy. Application of this formalism to high-pressure phonon frequency data implies that phase transitions from hcp to Sm-type and to the ω-phase in the regular lanthanides and Zr, respectively, involve softening of the elastic constant C44, and that the rapid decrease under compression of an `unusual' high ambient-pressure TO mode Gruneisen parameter in Zn is related to the gradual transition from anisotropic→isotropic compressional behaviour with increasing pressure.
UR - http://www.scopus.com/inward/record.url?scp=0033688112&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033688112&partnerID=8YFLogxK
U2 - 10.1016/S0038-1098(00)00207-6
DO - 10.1016/S0038-1098(00)00207-6
M3 - Article
AN - SCOPUS:0033688112
VL - 115
SP - 335
EP - 339
JO - Solid State Communications
JF - Solid State Communications
SN - 0038-1098
IS - 7
ER -