2024-08-06 ノースカロライナ州立大学(NCState)
＜関連情報＞
- https://news.ncsu.edu/2024/08/depoling-repoling-ferroelectric-piezoelectric/
- https://www.nature.com/articles/s41467-024-50847-3
熱処理なしでリラクサーPbTiO3圧電単結晶の電気的脱分極と再分極が可能 Electrical de-poling and re-poling of relaxor-PbTiO3 piezoelectric single crystals without heat treatment
Hwang-Pill Kim,Mao-Hua Zhang,Bo Wang,Huaiyu Wu,Zhengze Xu,Sipan Liu,Sunho Moon,Yohachi Yamashita,Jong Eun Ryu,Jun Liu,Shujun Zhang,Long-Qing Chen & Xiaoning Jiang
Nature Communications Published:30 July 2024
DOI:https://doi.org/10.1038/s41467-024-50847-3
Abstract
Re-poling of unexpected partially depoled piezoelectric materials conventionally needs to be first fully depoled through annealing above their Curie temperature to revive piezoelectric performances. Here, we investigated de-poling and re-poling of Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystals under electric fields at room temperature. We found that alternating current electric fields with amplitudes near the coercive field at low frequencies (<10 Hz) can be employed to successfully depolarize poled crystals at room temperature. We also demonstrated a reversible polarization switching process with a relaxor-PbTiO3 single crystal ultrasound transducer without device performance degradations. This experimental observation is supported by phase-field simulation, showing that alternating current electric fields can readily induce de-poling at room temperature, while direct current electric fields induce a transient depoled state only within an uncontrollable short period of time. The findings suggest new strategies for unprecedented in-device tailoring of the polarization states of ferroelectric materials.
