First order phase transition in deuterated triglycine selenate under an electric field: experimental study and analysis in the frame of Landau theory

Romero, Francisco Sacristán; Gallardo, M. C.; Valero, Constantino

doi:10.1088/0953-8984/21/15/155902

Cited by 3 publications

(2 citation statements)

References 27 publications

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“…23 On cooling experiments, data and Landau theory expectations were found to be in full agreement. The whole set of experimental data were successfully described through a 2-4-6 classical Landau potential, whose coefficients were also determined.…”

Section: Introductionmentioning

confidence: 68%

Deuteration effect on tricritical phase transition of triglycine selenate: Calorimetric and dielectric measurements analyzed in the framework of Landau theory

Romero

Gallardo

Martín‐Olalla

et al. 2010

Journal of Applied Physics

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The ferroelectric phase transition of three single crystals of ͑TGSe͒ 1−x ͑DTGSe͒ x has been described by using specific heat, latent heat, and dielectric permittivity measurements. Pure, half-deuterated, and highly-deuterated TGSe single crystals were analyzed. Transition temperature and latent heat increase with increasing deuteration. Irrespective of the degree of deuteration, a 2-4-6 Landau model is suitable to describe the phase transition. The fourth-rank prefactor in Landau potential is found to be very sensitive to deuteration while the second-rank and the sixth-rank prefactors smoothly change with composition. The pyroelectric figure of merit for these materials has also been derived from the theoretical model.

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Section: Introductionmentioning

confidence: 68%

Deuteration effect on tricritical phase transition of triglycine selenate: Calorimetric and dielectric measurements analyzed in the framework of Landau theory

Romero

Gallardo

Martín‐Olalla

et al. 2010

Journal of Applied Physics

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“…The method has been successfully applied to a variety of materials and the latent heat of their phase transitions has been accurately determined [16][17][18][19][20][21][22][23][24][25][26], even for near tricritical phase transitions.…”

Section: Introductionmentioning

confidence: 99%

Square-modulated differential thermal analysis: measuring method

Valero

Manchado²,

Romero³

et al. 2012

Meas. Sci. Technol.

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A conduction calorimetry technique has been used to characterize qualitatively and quantitatively first-order phase transitions. A series of long-period square thermal pulses superimposed on a temperature ramp (square-modulated differential thermal analysis) is applied to the sample and the heat flux is measured by highly sensitive fluxmeters. In a single run, the specific heat behavior is determined and the heat flux due to the temperature dependence of the specific heat is obtained. This contribution is subtracted from the measured heat flux and the value of the latent heat is extracted. The analysis of the fluxmeter’s response allows us to know if it is necessary to carry out a second experiment in order to study the kinetics of the transformation in depth. In this second run, the temperature ramp is only used to obtain the DTA trace. Four materials with first-order phase transitions, ranging from narrow coexistence intervals to very large ones and exhibiting smooth or very abrupt transformations, have been studied using this technique.

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Features of Phase Transitions in Nanostructured Ferroelectric Oxides Revealed from Calorimetric Data

et al. 2011

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First order phase transition in deuterated triglycine selenate under an electric field: experimental study and analysis in the frame of Landau theory

Cited by 3 publications

References 27 publications

Deuteration effect on tricritical phase transition of triglycine selenate: Calorimetric and dielectric measurements analyzed in the framework of Landau theory

Deuteration effect on tricritical phase transition of triglycine selenate: Calorimetric and dielectric measurements analyzed in the framework of Landau theory

Square-modulated differential thermal analysis: measuring method

Features of Phase Transitions in Nanostructured Ferroelectric Oxides Revealed from Calorimetric Data

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