Inverse barocaloric effects in ferroelectric BaTiO3 ceramics | Zendy

Enric SternTaulats | Zendy; Pol Lloveras | Zendy; Marı́a Barrio | Zendy; Emmanuel Defaÿ | Zendy; M. Egilmez | Zendy; Antoni Planes | Zendy; J. Ll. Tamarit | Zendy; Lluı́s Mañosa | Zendy; N. D. Mathur | Zendy; Xavier Moya | Zendy

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Inverse barocaloric effects in ferroelectric BaTiO3 ceramics

Author(s) -

Enric SternTaulats,

Pol Lloveras,

Marı́a Barrio,

Emmanuel Defaÿ,

M. Egilmez,

Antoni Planes,

J. Ll. Tamarit,

Lluı́s Mañosa,

N. D. Mathur,

Xavier Moya

Publication year - 2016

Publication title -

apl materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.571

H-Index - 60

ISSN - 2166-532X

DOI - 10.1063/1.4961598

Subject(s) - materials science , ferroelectricity , tetragonal crystal system , phase transition , ferroelectric ceramics , ceramic , condensed matter physics , isothermal process , orthorhombic crystal system , thermal expansion , inverse , calorimetry , antiferroelectricity , thermodynamics , electrocaloric effect , thermal , composite material , dielectric , crystal structure , crystallography , chemistry , physics , geometry , optoelectronics , mathematics

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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