Europhys. Lett., 63 (3) , pp. 453-458 (2003)
Investigations of the thermal parameters of ferroelectric liquid crystals using the pyroelectric effect in the S C* phaseS. Longuemart1, A. Hadj Sahraoui1, D. Dadarlat2, A. Daoudi1, V. Laux1 and J.-M. Buisine1
1 Laboratoire de Thermophysique de la Matière Condensée, Université du Littoral 145 Avenue Maurice Schumann, 59140 Dunkerque, France
2 National R.D Institute for Isotopic and Molecular Technologies POB 700, 3400 Cluj-Napoca 5, Romania
(Received 6 January 2003; accepted in final form 5 June 2003)
The pyroelectric complex signal generated by a periodically heated ferroelectric liquid crystal film (smectic C * phase) is analysed to simultaneously obtain its thermal diffusivity and effusivity. The heating source is an intensity-modulated laser. The thermal parameters are derived from the frequency behavior of the amplitude or the phase of the signal. This method can be used for the study of different kinds of pyroelectric materials (single crystals, polymers, liquid crystals, ceramics).
77.84.Nh - Liquids, emulsions, and suspensions; liquid crystals.
77.70.+a - Pyroelectric and electrocaloric effects.
66.30.Xj - Thermal diffusivity.
© EDP Sciences 2003