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Size effects of electrocaloric cooling in ferroelectric nanowires
Author(s) -
Huang Houbing,
Zhang Guangzu,
Ma Xingqiao,
Liang Deshan,
Wang Jianjun,
Liu Yang,
Wang Qing,
Chen LongQing
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15304
Subject(s) - nanowire , materials science , ferroelectricity , adiabatic process , electrocaloric effect , isothermal process , phase boundary , condensed matter physics , thin film , composite material , phase (matter) , optoelectronics , nanotechnology , thermodynamics , chemistry , physics , organic chemistry , dielectric
Considering finite size effect, ferroelectric nanowires may show novel phenomena compared to ferroelectric thin film and bulk. Here we investigated the effect of width and surface compressive stress on electrocaloric cooling in ferroelectric nanowire by using thermodynamic calculations and phase‐field simulations. It was found that the isothermal entropy change and adiabatic temperature change in nanowire are 50% larger than that in thin film due to different mechanical boundary conditions of nanowire and thin film. The largest electrocaloric temperature changes were shown to increase significantly either with the decrease in nanowire width or the increase with the surface compressive stress. It was also revealed that the largest intrinsic entropy changes are almost the same for different nanowires with different widths and various stresses. The present study therefore contributes to the understanding of size effects of electrocaloric cooling and provides guidance for experiments to design high‐efficiency cooling devices using ferroelectric nanosystems.