J. Phys. I France
Volume 2, Numéro 9, September 1992
Page(s) 1833 - 1846
DOI: 10.1051/jp1:1992249
J. Phys. I France 2 (1992) 1833-1846

Structural phase transition in p-quaterphenyl : a Raman study of the influence of temperature and pressure

A. Girard, Y. Délugeard, L. Pichon and B. Toudic

Groupe Matière Condensée et Matériaux URA au CNRS 804, Université de Rennes I, Campus de Beaulieu, 35042 Rennes Cedex, France

(Received 27 December 1991, accepted in final form 30 March 1992)

A Raman scattering study of p-quaterphenyl is reported as function of temperature and pressure. At atmospheric pressure, a line broadening in the vicinity of the transition gives a direct support of the order-disorder mechanism. The phase diagram has been determined. The mechanism of the transition is analysed up to 4 kbar and shows an evolution towards a displacive regime, the transition remaining continuous.

Une étude par diffusion Raman du p-quaterphényle est présentée en fonction de la température et de la pression. A pression atmosphérique, un élargissement de bande au voisinage de la transition donne un support direct du mécanisme ordre-désordre. Le diagramme de phase a été déterminé. Le mécanisme de la transition est analysé jusqu'à 4 kbar et montre une évolution vers un régime displacif, la transition restant continue.

© Les Editions de Physique 1992

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