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Influence of Finite Size on the Electrocaloric Response in PbTiO 3 Ceramics Near Room Temperature Using Landau Theory
Author(s) -
Liu Zhen,
Yang Bin,
Cao Wenwu,
Lookman Turab
Publication year - 2018
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201700469
Subject(s) - electrocaloric effect , materials science , grain size , condensed matter physics , landau theory , ferroelectricity , adiabatic process , ceramic , ferroelectric ceramics , electric field , phase (matter) , phase transition , thermodynamics , composite material , physics , dielectric , optoelectronics , quantum mechanics
We investigate the influence of grain size on the electrocaloric properties of ferroelectric systems using Landau theory. We study how the phase transformation temperature and electrocaloric property can be tuned by changing the grain size close to the critical size. Our results show that the electrocaloric coefficient at room temperature can be greatly enhanced by controlling the grain size. In particular, we calculate the adiabatic temperature change, Δ T to be ≈2 K with an electric field difference Δ E = 50 kV cm −1 at room temperature in a model for PbTiO 3 ceramics. The results provide an approach to improving the electrocaloric properties at room temperature in experiments by engineering the grain size.