Abstract
The phase transition in octafluoronaphthalene has been investigated by Raman scattering and neutron powder diffraction. The weight of the experimental evidence points to a unit cell doubling in the a direction, but with no change in space group symmetry. Lattice dynamics calculations support this evidence and indicate that the mechanism of the phase transition may well be the instability of a zone boundary acoustic mode of librational character. The structure of the low-temperature phase has been refined and the Raman spectra of the upper and lower phases are reported.
Original language | English |
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Journal | Journal of Physics C: Solid State Physics |
Volume | 10 |
Issue number | 8 |
Pages (from-to) | 1133-1149 |
ISSN | 0022-3719 |
DOIs | |
Publication status | Published - 1977 |