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Broad Phase Transition of Fluorite‐Structured Ferroelectrics for Large Electrocaloric Effect
Author(s) -
Park Min Hyuk,
Mikolajick Thomas,
Schroeder Uwe,
Hwang Cheol Seong
Publication year - 2019
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201900177
Subject(s) - electrocaloric effect , phase transition , ferroelectricity , materials science , isothermal process , condensed matter physics , atmospheric temperature range , hafnia , thermodynamics , cubic zirconia , dielectric , optoelectronics , physics , composite material , ceramic
Field‐induced ferroelectricity in (doped) hafnia and zirconia has attracted increasing interest in energy‐related applications, including energy harvesting and solid‐state cooling. It shows a larger isothermal entropy change in a much wider temperature range compared with those of other promising candidates. The field‐induced phase transition occurs in an extremely wide temperature range, which contributes to the giant electrocaloric effect. This article examines the possible origins of a large isothermal entropy change, which can be related to the extremely broad phase transitions in fluorite‐structured ferroelectrics. While the materials possess a high entropy change associated with the polar–nonpolar phase transition, which can contribute to the high energy performance, the higher breakdown field compared with perovskites practically determines the available temperature range.