Correlations between elastic, calorimetric, and polar properties of ferroelectric PbSc0.5Ta0.5O3 (PST)

Calorimetric, elastic, and polar properties of ferrolectric lead scandium tantalate PbSc0.5Ta0.5O3 with 65% cation order have been investigated in the vicinity of the paraelectric-ferroelectric transition at T trans = 295 K. Comparison of temperature dependencies of the excess specific heat and elas...

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Bibliographic Details
Published in:Applied physics letters 2019-10, Vol.115 (16)
Main Authors: Linyu, Gan, Romero, Francisco Javier, Franco, Victorino, Martín-Olalla, José-María, Gallardo, María Carmen, Salje, Ekhard K. H., Zhou, Yumei, Aktas, Oktay
Format: Article
Language:English
Subjects:
Anomalies
Applied physics
Elastic properties
Ferroelectric materials
Ferroelectricity
Heat measurement
Order parameters
Scandium
Variation
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Summary:Calorimetric, elastic, and polar properties of ferrolectric lead scandium tantalate PbSc0.5Ta0.5O3 with 65% cation order have been investigated in the vicinity of the paraelectric-ferroelectric transition at T trans = 295 K. Comparison of temperature dependencies of the excess specific heat and elastic properties indicates that both anomalies stem from thermal fluctuations of order parameters in three dimensions. These fluctuations are consistent with the tweed microstructure. This transition is driven by several coupled thermodynamic order parameters, as evidenced by a strongly nonlinear scaling of the excess entropy with the squared ferroelectric polarization.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.5116753