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Updated: May 5, 2026
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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
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Pressure-Induced Structural Phase Transition in Gd2Ce2O7 Oxide.
1State Key Laboratory of High Pressure and Superhard Materials, Jilin University, Changchun 130012, China.
Materials (Basel, Switzerland)
|May 4, 2026
Summary
Gadolinium cerium oxide (Gd2Ce2O7) undergoes an irreversible structural transformation under high pressure. This phase transition, from cubic to monoclinic, is driven by cation rearrangement and persists even after pressure is released.
Area of Science:
- Materials Science
- Solid State Chemistry
- High-Pressure Physics
Background:
- Gadolinium cerium oxide (Gd2Ce2O7) is a pyrochlore material with potential applications in various fields.
- Understanding its structural behavior under extreme conditions is crucial for predicting its stability and performance.
Purpose of the Study:
- To investigate the high-pressure structural evolution of Gd2Ce2O7.
- To identify any pressure-induced phase transitions and their underlying mechanisms.
Main Methods:
- Synchrotron X-ray diffraction was employed to analyze structural changes up to 31.8 GPa.
- Raman spectroscopy was utilized to probe vibrational properties up to 38.9 GPa.
Main Results:
- A phase transition from a cubic (Ia-3) to a monoclinic (C2/m) crystal structure was observed, initiating at 11.3 GPa.
- The transition is attributed to compression-induced cation rearrangement, altering local coordination environments.
- The transformation proceeded continuously and remained stable up to the highest experimental pressure.
Conclusions:
- Gd2Ce2O7 undergoes an irreversible structural transformation to a monoclinic phase under high pressure.
- The high-pressure monoclinic phase is stable upon decompression, indicating a permanent change in the material's structure.
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