Pressure-induced amorphization in Y2(WO4)3: in situ X-ray diffraction and Raman studies |
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Authors: | S Karmakar SK Deb Surinder M Sharma |
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Institution: | a Bhabha Atomic Research Centre, Synchrotron Radiation Section, Mumbai, 400 085, India b Applied Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India |
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Abstract: | The high-pressure behavior of Y2(WO4)3 has been investigated at room temperature by in situ X-ray diffraction and Raman scattering measurements. Both the studies show that beyond ∼3 GPa, this compound smoothly transforms from the ambient orthorhombic phase to a disordered phase. The structural modifications are found to be reversible up to ∼4 GPa but become irreversible at higher pressures. Low pressures of transformation imply that these changes are intrinsic and not due to non-hydrostatic stresses. In addition, the correlation between the stability range of orthorhombic phase and counter cation size supports that this compound has a large field of negative thermal expansion in this family of compounds. |
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Keywords: | High pressure Y2(WO4)3 X-ray diffraction Raman scattering |
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