Brillouin scattering in p-polyphenyls. III. The improper ferroelastic phase transition of p-terphenyl
- 15 July 1984
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 81 (2) , 599-606
- https://doi.org/10.1063/1.447732
Abstract
The elastic properties of p-terphenyl were studied in its high and low temperature phases. The 13 elastic constants were determined in the monoclinic phase, whereas 16 elastic constants were found sufficient to describe the elastic properties of the triclinic phase. In this phase the main change in the Brillouin spectra is a splitting of a quasilongitudinal line. This splitting varies like the square of the order parameter. A quasielastic component is observed in the vicinity of the transition temperature. Deuterated and hydrogenated samples revealed the same behavior. Elastic anomalies are tentatively interpreted inside the frame of the Landau theory.Keywords
This publication has 21 references indexed in Scilit:
- Double-well potentials and structural phase transitions in polyphenylsFaraday Discussions of the Chemical Society, 1980
- Incommensurate phases in biphenylSolid State Communications, 1979
- Inelastic neutron scattering study of structural phase transitions in polyphenylsSolid State Communications, 1979
- Calorimetric Study of the Phase Transition of Para-TerphenylMolecular Crystals and Liquid Crystals, 1979
- Phase transitions in polyphenyls: Raman spectra of p-terphenyl and p-quaterphenyl in the solid stateChemical Physics, 1978
- Raman Scattering Study of the order—disorder phase transition in para-terphenylChemical Physics Letters, 1978
- Structural phase transition in polyphenyls. IV. Double-well potential in the disordered phase of p-terphenyl from neutron (200 K) and X-ray (room-temperature) diffraction dataActa Crystallographica Section B: Structural Science, Crystal Engineering and Materials, 1977
- Variation du spectre infrarouge lointain du p-terphényle entre 300 K et 1,3 KJournal de Physique, 1977
- Long range order at the phase transition in paraterphenylSolid State Communications, 1976
- Possible Species of Ferromagnetic, Ferroelectric, and Ferroelastic CrystalsPhysical Review B, 1970