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

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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.

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Romero, F.J., Gallardo, M.C., Czarnecka, A. et al. Thermal and kinetic study of the ferroelectric phase transition in deuterated triglycine selenate. J Therm Anal Calorim 87, 355–361 (2007). https://doi.org/10.1007/s10973-005-7444-7

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