Phase Transition of <i>α</i>-FePO<sub>4</sub> under High Pressure: A Raman Spectroscopy Study

WANG Yue; XU Chaowen; LI Ying; GAO Jing

doi:10.11858/gywlxb.20251100

Volume 39 Issue 10

Oct 2025

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Chinese Journal of High Pressure Physics > 2025 > 39(10): 100105.

WANG Yue, XU Chaowen, LI Ying, GAO Jing. Phase Transition of α-FePO4 under High Pressure: A Raman Spectroscopy Study[J]. Chinese Journal of High Pressure Physics, 2025, 39(10): 100105. doi: 10.11858/gywlxb.20251100

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WANG Yue, XU Chaowen, LI Ying, GAO Jing. Phase Transition of α-FePO₄ under High Pressure: A Raman Spectroscopy Study[J]. Chinese Journal of High Pressure Physics, 2025, 39(10): 100105. doi: 10.11858/gywlxb.20251100

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Phase Transition of α-FePO₄ under High Pressure: A Raman Spectroscopy Study

doi: 10.11858/gywlxb.20251100

WANG Yue^1
,,
XU Chaowen²,
LI Ying²,
GAO Jing^{1,*
,
,}

1.
Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, Hainan, China
2.
Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China

Received Date: 29 May 2025
Rev Recd Date: 29 Jun 2025

Available Online: 05 Jul 2025

Issue Publish Date: 05 Oct 2025

Abstract

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-Ⅱ at 4.6 GPa. Between 4.6−27.3 GPa, the (meta) stability of FePO₄-Ⅱ is 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-Ⅱ exhibits 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 underpinning stability in orthophosphates, and forecasts structural evolution pathways. The findings offer insights into high-pressure dynamic response of quartz-like minerals.
- α-quartz,
- orthophosphate,
- diamond anvil cell,
- Raman spectroscopy,
- phase transition

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References(31)

References

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Phase Transition of α-FePO₄ under High Pressure: A Raman Spectroscopy Study

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Phase Transition of α-FePO₄ under High Pressure: A Raman Spectroscopy Study