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Inne
Phase transition of the novel hydrogen bonded ferroelectric (NH4)2H2P2O6 studied by specific heat measurements.
Autorzy
Rok wydania
2012
Czasopismo
Numer woluminu
527
Strony
8-12
DOI
10.1016/j.tca.2011.09.016
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The first precise measurements of specific heat changes have been performed for a novel ferroelectric material, (NH4)2H2P2O6 by means of an ac calorimeter. The paraelectric–ferroelectric phase transition at about 177.5 K of second order type is revealed and described by the Landau model using specific heat and linear birefringence data. Thermal parameters (such as the excess enthalpy (ΔH) and the excess entropy (ΔS)) of the continuous phase transition were estimated and discussed. The calorimetric measurements indicate a complex mechanism of the ferroelectric transition, both a displacive and order–disorder contributions are suggested.
Słowa kluczowe
ferroelectric, phase transition, ac calorimetry, Hipodiphosphate
Adres publiczny
https://doi.org/10.1016/j.tca.2011.09.016
Strona internetowa wydawcy
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