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Improper ferroelectrics as high‐efficiency energy conversion materials
Author(s) -
Wakamatsu Toru,
Tanabe Kenji,
Terasaki Ichiro,
Taniguchi Hiroki
Publication year - 2017
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.201700009
Subject(s) - pyroelectricity , ferroelectricity , materials science , polarization (electrochemistry) , electric field , magnetization , energy harvesting , energy transformation , coupling (piping) , energy conversion efficiency , electric potential energy , optoelectronics , energy (signal processing) , engineering physics , physics , magnetic field , composite material , dielectric , chemistry , quantum mechanics , thermodynamics
An improper ferroelectric is a certain type of ferroelectrics whose primary order parameter is not polarization but another physical quantity such as magnetization. In contrast to a conventional proper ferroelectrics as represented by Pb(Zr,Ti)O 3 and BaTiO 3 , the improper ferroelectrics has been inconceivable for practical applications thus far. Herein, we illustrate the great potential of improper ferroelectrics for efficient conversion of temperature fluctuation to electric energy, as demonstrated with (Ca 0.84 Sr 0.16 ) 8 [AlO 2 ] 12 (MoO 4 ) 2 (CSAM‐16). The present study has experimentally proven that CSAM‐16 achieves an excellent electrothermal coupling factor and high electric field sensitivity for pyroelectric energy conversion that approach a practical level for application to self‐powered autonomous electronic devices for rapidly spreading wireless sensor networks. The present results provide a novel approach to developing innovative pyroelectric energy harvesting devices using improper ferroelectrics.