2026-09-18 総合科学研究機構,量子科学技術研究開発機構,広島大学,J-PARCセンター,韓国原子力研究院
図１．急冷による構造相転移の抑制
PMN-30%PTをゆっくり冷却すると、構造相転移によりX線回折ピークが2つに分裂する。一方、350 K/sで急冷するとピーク分裂がほぼ消失し、巨視的な構造相転移が抑制される。
＜関連情報＞
- https://www.qst.go.jp/site/press/20260918.html
- https://journals.aps.org/prmaterials/abstract/10.1103/tnnk-lhcn
リラクサー強誘電体における緩慢な相転移速度と拡張された臨界相関 Sluggish phase-transition kinetics and extended critical correlations in relaxor ferroelectrics
Masato Matsuura, Kenji Ohwada, Shinya Tsukada, Akihiko Machida, Tatsuya Kikuchi, and Young-Soo Han
Physical Review Materials Published: 8 September, 2026
DOI: https://doi.org/10.1103/tnnk-lhcn
Abstract
Giant responses over wide temperature ranges in relaxor ferroelectrics remain a puzzling phenomenon in solid state physics. Rapid-quenching x-ray diffraction demonstrates pronounced kinetic suppression of macroscopic structural ordering in (1−)Pb(Mg1/3Nb2/3)O3−PbTiO3 near the morphotropic phase boundary. Independently, neutron scattering reveals scale-free spatial and temporal correlations of polar nanoregions over the temperature range associated with the giant dielectric response. Taken together, these observations support a kinetic picture in which sluggish structural ordering allows near-critical relaxor fluctuations to persist over an extended temperature range.
