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- W1514670537 abstract "Nearly all displacive transitions have been considered to be continuous or second order,and the rigid unit mode(RUM) provides a natural candidate for the soft mode.However,in-situ X-ray diffraction and Raman measurements show clearly the first-order evidences for the scheelite-to-fergusonite displacive transition in BaWO 4:a 1.6% volume collapse,coexistence of phases,and hysteresis on release of pressure.Such first-order signatures are found to be the same as the soft modes in BaWO 4,which indicates the scheelite-to-fergusonite displacive phase transition hides a deeper physical mechanism.By the refinement of atomic displacement parameters,we further show that the first-order character of this phase transition stems from a coupling of large compression of soft BaO 8 polyhedrons to the small displacive distortion of rigid WO 4 tetrahedrons.Such a coupling will lead to a deeper physical insight in the phase transition of the common scheelite-structured compounds." @default.
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- W1514670537 date "2012-01-01" @default.
- W1514670537 modified "2023-09-23" @default.
- W1514670537 title "First-order character of the displacive structural transition in BaWO4" @default.
- W1514670537 hasPublicationYear "2012" @default.
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