Phase transitions in Sc2(WO4)3 under high pressure

Garg, Nandini ; Murli, Chitra ; Tyagi, A. K. ; Sharma, Surinder M. (2005) Phase transitions in Sc2(WO4)3 under high pressure Physical Review - B: Solid State (former title), 72 (6). 0646106_1-064106_7. ISSN 0556-2805

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High-pressure x-ray diffraction and Raman scattering studies on scandium tungstate [Sc2(WO4)3] show that it transforms to a monoclinic phase at -0.6± 0.3 GPa. The high-pressure phase has P21/a symmetry and is related to the initial orthorhombic phase through cell doubling along the c axis. The compound undergoes another phase transition at -1.6 GPa, accompanied by a volume reduction of -8%. At -6.5 GPa, the diffraction pattern and Raman spectra of Sc2(WO4)3 indicate the emergence of a disordered crystalline state which evolves into an amorphous phase beyond -14 GPa. The structural changes are found to be reversible up to -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.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:81877
Deposited On:08 Feb 2012 12:43
Last Modified:08 Feb 2012 12:43

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