Journal de Physique III

Issue		J. Phys. III France Volume 2, Number 6, June 1992
Page(s)		1029 - 1038
DOI		10.1051/jp3:1992176

DOI: 10.1051/jp3:1992176
J. Phys. III France 2 (1992) 1029-1038

Piezothermal analysis of the N $_{\rm Re}$ -S $_{\rm Ad}$ transition on small samples of p-octylbenzoate p-cyanobenzoyloxyphenyl

A. Anakkar¹, J. M. Buisine¹, C. Alba-Simionesco², L. Ter Minassian², H. T. Nguyen³ and C. Destrade³

¹ Equipe de Dynamique et Structure des Matériaux Moléculaires, U.A. CNRS n° 801, Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq, France
² Laboratoire de Chimie Physique, Université Pierre et Marie Curie, U.A. CNRS n° 176, U.A. CNRS n° 721, 11 rue P. et M. Curie, 75231 Paris Cedex, France
³ Centre de Recherche Paul Pascal, Domaine Universitaire, 33405 Talence Cedex, France

(Received 16 December 1991, accepted 27 February 1992)

Abstract
In order to detect weakly first-order phase transitions by means of piezothermal measurements on small samples of calamitic mesogens exhibiting reentrant phenomena, a new high pressure calorimeter equipped with a composite slab thermostat has been built. Its efficiency has been proved and its performances determined. Its use on a ten cubic millimeter effective volume of p-octylbenzoate p-cyanobenzoyloxyphenyl has permitted to prove the N $_{\rm Re}$ -S $_{\rm Ad}$ transition is not purely second order but weakly first-order.

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Piezothermal analysis of the N -S transition on small samples of p-octylbenzoate p-cyanobenzoyloxyphenyl

Piezothermal analysis of the N $_{\rm Re}$ -S $_{\rm Ad}$ transition on small samples of p-octylbenzoate p-cyanobenzoyloxyphenyl