高压物理学报2025，Vol.39Issue(10)：50-58,9.DOI:10.11858/gywlxb.20251100
α-FePO4高压相变行为的拉曼光谱研究
Phase Transition of α-FePO4 under High Pressure:A Raman Spectroscopy Study
摘要
Abstract
Given the topological isomorphism between α-FePO4 and α-quartz,this study employed a diamond anvil cell coupled with Raman spectroscopy to examine the phase transition of α-FePO4.The structural evolution across a pressure range of 0.2-27.3 GPa was delineated into three stages.At 2.8-3.6 GPa,α-FePO4 initiates a phase transition,achieving a complete transformation to FePO4-Ⅱat 4.6 GPa.Between 4.6-27.3 GPa,the(meta)stability of FePO4-Ⅱis predicated on the cooperative deformation of the adaptable[FeO6]octahedra and the rigid[PO4]tetrahedra.The progressive increase in structural disorder and the slowing of vibrational frequency shifts signify a transition to a non-linear compression regime.Notably,in the 9.8-11.1 GPa threshold,discontinuous variations in P―O bond lengths and mode widths serve as evidences of pressure-induced heterogeneous strain within the[FeO6]-[PO4]network,suggesting entry into a metastable region.Upon decompression to 4.6 GPa,FePO4-Ⅱexhibits partial recovery of structural order,maintaining metastability at ambient conditions,which underscores its unique pressure memory characteristics.This study demarcates the stability boundary of α-FePO4,elucidates the fundamental mechanisms under-pinning stability in orthophosphates,and forecasts structural evolution pathways.The findings offer insights into high-pressure dynamic response of quartz-like minerals.关键词
α-石英/正磷酸盐/金刚石压腔/拉曼光谱/相变Key words
α-quartz/orthophosphate/diamond anvil cell/Raman spectroscopy/phase transition分类
数理科学引用本文复制引用
王越,徐超文,李营,高静..α-FePO4高压相变行为的拉曼光谱研究[J].高压物理学报,2025,39(10):50-58,9.基金项目
中国科学院深海科学与工程研究所自主部署项目(E371070101) （E371070101）
