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Alternative photopyroelectric detection method of phase transitions in ferroelectric materials

D. DADARLAT1, D. CHICEA2,* , N. HOURIEZ3, S. DELENCLOS3, S. LONGUEMART3, A. HADJ SAHRAOUI3

Affiliation

  1. National Institute for Research and Development of Isotopic and Molecular Technologies, P.O. Box 700, Cluj-Napoca 5, R-3400, Romania
  2. Physics Department, “Lucian Blaga” University, Str. Dr. Ioan Ratiu 5-7, Sibiu, Romania
  3. Laboratoire de Thermophysique de la Matière Condensée, équipe UMR CNRS 8024, Université du Littoral Côte d'Opale, 145 Avenue Maurice Schumann, F-59140 Dunkerque, France

Abstract

An alternative photopyroelectric (PPE) configuration for phase transitions investigations in ferroelectric materials, used as pyroelectric sensors in a PPE detection cell, is proposed. The method is based on the temperature scan of the phase of the complex PPE signal. The technique uses the “front” PPE detection configuration, at two different chopping frequencies, in order to derive a dynamic thermal parameter, the thermal diffusivity. The suitability of the method was proved by measurements of the behaviour of the thermal diffusivity of tryglycine sulphate (TGS) close to the Curie point (490C) and for different external electric fields (ranging from 0 to 10 kV/m)..

Keywords

Photopyroelectric calorimetry, Phase transitions, Ferroelectric materials, Thermal diffusivity.

Citation

D. DADARLAT, D. CHICEA, N. HOURIEZ, S. DELENCLOS, S. LONGUEMART, A. HADJ SAHRAOUI, Alternative photopyroelectric detection method of phase transitions in ferroelectric materials, Optoelectronics and Advanced Materials - Rapid Communications, 3, 4, April 2009, pp.323-325 (2009).

Submitted at: Feb. 23, 2009

Accepted at: April 23, 2009