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Pressure-Induced Structural Phase Transition in Gd2Ce2O7 Oxide
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DOI：10.3390/ma19081615.png)
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Abstract
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The high-pressure structural evolution of Gd2Ce2O7 has been studied by synchrotron X-ray diffraction (up to 31.8 GPa) and Raman spectroscopy (up to 38.9 GPa). A pressure-induced phase transition from cubic (space group Ia-3) to monoclinic (C2/m) crystal structure was observed to initiate at 11.3 GPa. This transition was primarily driven by the compression-induced cation rearrangement, which significantly altered the local coordination environment. The structural transformation proceeded via a gradual, continuous pathway and persisted up to the maximum experimental pressure of 31.8 GPa. Notably, the high-pressure phase remains stable upon complete decompression, confirming an irreversible structural transformation of Gd2Ce2O7.
Keywords:
structural phase transition
the rare earth C-type structure
Gd<sub>2</sub>Ce<sub>2</sub>O<sub>7</sub>
high pressure
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