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Media type:
E-Article
Title:
Inverse barocaloric effects in ferroelectric BaTiO3 ceramics
Contributor:
Stern-Taulats, E.;
Lloveras, P.;
Barrio, M.;
Defay, E.;
Egilmez, M.;
Planes, A.;
Tamarit, J.-LI.;
Mañosa, Ll.;
Mathur, N. D.;
Moya, X.
imprint:
AIP Publishing, 2016
Published in:APL Materials
Language:
English
DOI:
10.1063/1.4961598
ISSN:
2166-532X
Origination:
Footnote:
Description:
<jats:p>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.</jats:p>