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Journal of Thermal Analysis and Calorimetry

, Volume 87, Issue 2, pp 355–361 | Cite as

Thermal and kinetic study of the ferroelectric phase transition in deuterated triglycine selenate

  • F. J. Romero
  • M. C. Gallardo
  • A. Czarnecka
  • M. Koralewski
  • J. del Cerro
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Abstract

The specific heat and the enthalpy variation of a highly deuterated crystal of ferroelectric triglycine selenate have been measured around its first-order phase transition using the technique square modulated differential thermal analysis (SMDTA). The low temperature variation rate has allowed analyzing the kinetics of the phase transition. Due to an internal crack in the sample, the transition is carried out in two steps and an intermediate region where the transition is blocked and both phases coexist without transformation has been found. The latent heat on cooling (L c=1.32±0.02 J g–1) is higher than on heating (L h=1.08±0.02 J g–1) due to the thermal hysteresis and the great difference between the specific heat in both phases. Nevertheless, the enthalpy balance is fulfilled on heating and on cooling.

Keywords

DTGSe latent heat metastable state SMDTA specific heat 

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • F. J. Romero
    • 1
  • M. C. Gallardo
    • 1
  • A. Czarnecka
    • 2
  • M. Koralewski
    • 2
  • J. del Cerro
    • 1
  1. 1.Departamento de Física de la Materia CondensadaInstituto Mixto de Ciencia de Materiales CSIC-Universidad de SevillaSevillaSpain
  2. 2.Institute of PhysicsAdam Mickiewicz UniversityPoznanPoland

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