Open AccessGiant isothermal entropy change In (111)-oriented PMN–PT thin film
Author(s) -
Mahmoud A. Hamad
Publication year - 2014
Publication title -
journal of advanced dielectrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.38
H-Index - 13
eISSN - 2010-135X
pISSN - 2010-1368
DOI - 10.1142/s2010135x1450026x
Subject(s) - isothermal process , curie temperature , materials science , electrocaloric effect , ferroelectricity , electric field , heat capacity , condensed matter physics , thin film , thermodynamics , entropy (arrow of time) , analytical chemistry (journal) , physics , nanotechnology , optoelectronics , chemistry , ferromagnetism , quantum mechanics , dielectric , chromatography
An isothermal entropy change of 240 nm (111)-oriented PMN–PT 65/35 film near the ferroelectric Curie temperature, relative cooling power (RCP) and change of heat capacity have been investigated. The extracted data characterized giant isothermal entropy change of more than 16 J/kg K in electric field shift ΔE of 455 kV cm -1 , which is nearly twice than that found for PbZr 0.95 Ti 0.05 O 3 thin film at 492 kV cm -1 near the Curie point. Furthermore, the RCP ≈ 700 J/kg and change of heat capacity ≈ 233 J/kg K in electric field shift ΔE of 747 kV cm -1 .