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Monoclinic-tetragonal-monoclinic phase transitions in Eu0.1Bi0.9VO4 under pressure
D Errandonea1, A B Garg2, J Pellicer-Porres1
1Departament de Física Aplicada-ICMUV, Universitat de València, Dr. Moliner 50, 46100 Burjassot, Spain.
Summary
Europium-bismuth vanadate (Eu$_{0.1}$Bi$_{0.9}$VO$_{4}$) exhibits two reversible phase transitions under high pressure. These structural changes, studied using X-ray diffraction, reveal new high-pressure phases of this technological material.
Area of Science:
- Materials Science
- Solid State Physics
- Crystallography
Background:
- Eu$_{0.1}$Bi$_{0.9}$VO$_{4}$ is a promising technological material with potential applications.
- Understanding its structural behavior under extreme conditions is crucial for material design.
Purpose of the Study:
- To investigate the high-pressure structural phase transitions of Eu$_{0.1}$Bi$_{0.9}$VO$_{4}$ at room temperature.
- To characterize the crystal structures and compressional properties of the different phases.
Main Methods:
- In situ angle-dispersive powder X-ray diffraction (XRD) up to 24.9 GPa.
- Analysis of crystal structures, phase transitions, and equations of state.
Main Results:
- Two reversible phase transitions were observed at 1.9 GPa and 16.1 GPa.
- The first transition is a ferroelastic-paraelastic transformation from monoclinic fergusonite to tetragonal scheelite structure.
- A first-order transition to a new monoclinic phase (P2$_{1}$/n) occurs at 16.1 GPa, coexisting with the scheelite phase.
Conclusions:
- Eu$_{0.1}$Bi$_{0.9}$VO$_{4}$ exhibits complex structural polymorphism under high pressure.
- The observed transitions are reversible, indicating potential for pressure-induced applications.
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