Inverse barocaloric effects in ferroelectric BaTiO3 ceramics

We use calorimetry to identify pressure-driven isothermal entropy changes in ceramic samples of the prototypical ferroelectric BaTiO3. Near the structural phase transitions at ~400 K (cubic-tetragonal) and ~280 K (tetragonal-orthorhombic), the inverse barocaloric response differs in sign and magnitu...

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Bibliographic Details
Authors: Stern-Taulats, Enric, Lloveras Muntané, Pol Marcel|||0000-0003-4133-2223, Barrio Casado, María del|||0000-0003-3467-7581, Defay, Emmanuel, Egilmez, Mehmet, Planes Vila, Antoni, Tamarit Mur, José Luis|||0000-0002-7965-0000, Mañosa Carrera, Lluis, Mathur, N.D., Moya Raposo, Xavier
Format: article
Publication Date:2016
Country:España
Institution:Universitat Politècnica de Catalunya (UPC)
Repository:UPCommons. Portal del coneixement obert de la UPC
Language:English
OAI Identifier:oai:upcommons.upc.edu:2117/99041
Online Access:https://hdl.handle.net/2117/99041
https://dx.doi.org/10.1063/1.4961598
Access Level:Open access
Keyword:Calorimetry
Ceramic materials
Materials ceràmics
Calorimetria
Àrees temàtiques de la UPC::Enginyeria dels materials::Materials ceràmics
Àrees temàtiques de la UPC::Física::Termodinàmica
Description
Summary:We use calorimetry to identify pressure-driven isothermal entropy changes in ceramic samples of the prototypical ferroelectric BaTiO3. Near the structural phase transitions at ~400 K (cubic-tetragonal) and ~280 K (tetragonal-orthorhombic), the inverse barocaloric response differs in sign and magnitude from the corresponding conventional electrocaloric response. The differences in sign arise due to the decrease in unit-cell volume on heating through the transitions, whereas the differences in magnitude arise due to the large volumetric thermal expansion on either side of the transitions.

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