2024-03-28T15:47:29Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00024550
2023-01-16T04:14:56Z
336:695:696
Improper Ferroelectricity in Stuffed Aluminate Sodalites for Pyroelectric Energy Harvesting
Maeda, Yusaku
Wakamatsu, Toru
Konishi, Ayako
Moriwake, Hiroki
Moriyoshi, Chikako
Kuroiwa, Yoshihiro
Tanabe, Kenji
Terasaki, Ichiro
Taniguchi, Hiroki
open access
© 2017 American Physical Society
In the present study, we demonstrate ferroelectricity in stuffed aluminate sodalites (Ca1−xSrx)8[AlO2]12(WO4)2 (x≤0.2) (C1−xSxAW). Pyroelectric measurements clarify switchable spontaneous polarization in polycrystalline C1−xSxAW, whose polarization values are on the order of 10^−2 μC/cm^2 at room temperature. A weak anomaly in the dielectric permittivity at temperatures near the ferroelectric transition temperature suggests improper ferroelectricity of C1−xSxAW for all investigated values of x. A comprehensive study involving synchrotron x-ray powder diffraction measurements, molecular dynamics simulations, and first-principles calculations clarifies that the ferroelectric phase transition of C1−xSxAW is driven by the freezing of the fluctuations of WO4 tetrahedra in the voids of an [AlO2]12^12− framework. The voltage response and electromechanical coupling factor of C1−xSxAW estimated from the present results indicate that this material exhibits excellent performance as a pyroelectric energy harvester, suggesting that aluminate sodalites exhibit great promise as a class of materials for highly efficient energy-harvesting devices.
American Physical Society
2017-03-24
eng
journal article
VoR
http://hdl.handle.net/2237/26772
https://nagoya.repo.nii.ac.jp/records/24550
https://doi.org/10.1103/PhysRevApplied.7.034012
2331-7019
Physical Review Applied
7
3
034012
034012
https://nagoya.repo.nii.ac.jp/record/24550/files/PhysRevApplied7.pdf
application/pdf
4.8 MB
2018-02-22