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The specific heat of the ferroelectric phase transition in N(CH3)4CdBr3 |
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| Authors: | J. M. Igartua G. Aguirre-Zamalloa I. Ruiz-Larrea M. Couzi A. López-Echarri T. Breczewski |
| Affiliation: | (1) Depto de Física Aplicada II, Facultad de Ciencias, Universidad del País Vasco, Apto. 644, Bilbao, Spain;(2) Depto de Física de la Materia Condensada, Facultad de Ciencias, Universidad del País Vasco, Apto. 644, Bilbao, Spain;(3) Laboratoire de Spectroscopie Moléculaire et Cristalline, Université de Bordeaux I, 33405 Talence Cedex, France |
| Abstract: | The specific heat of N(CH3)4CdBr3 from 50 to 300 K has been measured by adiabatic calorimetry, using both static and dynamic methods. The obtained results have permitted a careful study of the ferro-paraelectric phase transition the crystal shows at 160 K. The available spectroscopic data have been used to generate a reliable baseline which accounts for the normal lattice contribution to the specific heat. These results allow for an accurate estimation of the phase transition thermodynamic functions: ΔH=2620 J·mol?1 and ΔS=18.04 J·(mol°C)?1. These high values are in agreement with the predictions of the 6 well potential Frenkel model. |
| Keywords: | adiabatic calorimetry ferroelectricity phase transitions specific heat |
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