Phase transitions in Sc{sub 2}(WO{sub 4}){sub 3} under high pressure
- Synchrotron Radiation Section, Bhabha Atomic Research Centre, Mumbai 400085 (India)
- Applied Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085 (India)
High-pressure x-ray diffraction and Raman scattering studies on scandium tungstate [Sc{sub 2}(WO{sub 4}){sub 3}] show that it transforms to a monoclinic phase at {approx}0.6{+-}0.3 GPa. The high-pressure phase has P2{sub 1}/a symmetry and is related to the initial orthorhombic phase through cell doubling along the c axis. The compound undergoes another phase transition at {approx}1.6 GPa, accompanied by a volume reduction of {approx}8%. At {approx}6.5 GPa, the diffraction pattern and Raman spectra of Sc{sub 2}(WO{sub 4}){sub 3} indicate the emergence of a disordered crystalline state which evolves into an amorphous phase beyond {approx}14 GPa. The structural changes are found to be reversible up to {approx}1.6 GPa. However, transformation to the amorphous state is found to be irreversible, though our results suggest some structural relaxation on release of pressure.
- OSTI ID:
- 20719307
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 6 Vol. 72; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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