High-Pressure Metathesis Synthesis and Physical Property Characterization of Cubic Fluorite-Structured CeO<sub>2</sub>Cl<sub>0.07</sub>

KOU Xingjian; LIU Jingyi; WANG Yangbin; LEI Li

doi:10.11858/gywlxb.20251286

Volume 40 Issue 6

Jun 2026

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Chinese Journal of High Pressure Physics > 2026 > 40(6): 063101.

KOU Xingjian, LIU Jingyi, WANG Yangbin, LEI Li. High-Pressure Metathesis Synthesis and Physical Property Characterization of Cubic Fluorite-Structured CeO2Cl0.07[J]. Chinese Journal of High Pressure Physics, 2026, 40(6): 063101. doi: 10.11858/gywlxb.20251286

Citation:

KOU Xingjian, LIU Jingyi, WANG Yangbin, LEI Li. High-Pressure Metathesis Synthesis and Physical Property Characterization of Cubic Fluorite-Structured CeO₂Cl_0.07[J]. Chinese Journal of High Pressure Physics, 2026, 40(6): 063101. doi: 10.11858/gywlxb.20251286

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High-Pressure Metathesis Synthesis and Physical Property Characterization of Cubic Fluorite-Structured CeO₂Cl_0.07

doi: 10.11858/gywlxb.20251286

Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, Sichuan, China

Received Date: 29 Dec 2025
Rev Recd Date: 03 Feb 2026

Available Online: 05 Feb 2026

Issue Publish Date: 05 Jun 2026

Abstract

Abstract

The 4f electron of Ce has long attracted extensive attention due to their unique delocalization mechanism and their influence on atomic structure, phase transformation behavior, and magnetic structure. In this paper, CeO₂Cl_0.07 was synthesized with a cubic fluorite structure by changing the stoichiometry of the precursors (CeCl₃, MgO powder) and regulating the high-pressure solid-state metathesis (HSM) reaction under high temperature and high pressure conditions (1873 K, 5 GPa) provided by a large volume press. Then pressure was provided by a diamond anvil cell (DAC), and the sample was characterized by high-pressure in-situ synchrotron X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), and high-pressure Raman spectroscopy. By comparing the obtained pressure-volume (p-V) curve with CeO₂, it is found that CeO₂Cl_0.07 is more compressible. The high-pressure Raman phonon spectrum (F_2g) is obtained, indicating that the pressure-dependent behavior of CeO₂Cl_0.07 exhibits anomalous changes at 0–2 GPa and near 15 GPa under non-hydrostatic pressure. We believe that the doping of Cl elements introduces oxygen vacancies, which increases the concentration of Ce³⁺, thereby causing the delocalization of 4f electron and resulting in the observed phenomenon. This study developed a new high-pressure synthesis pathway for cerium-based compounds and revealed their behavior under high-pressure conditions.
- high-pressure solid-state metathesis reaction,
- CeO₂,
- synchrotron radiation,
- Raman scattering,
- high-temperature and high-pressure,
- 4f electron

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References(28)

References

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