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- W2079188545 abstract "Abstract Densely packed zirconium tungstate blocks were synthesized by rapid solidification with a CO 2 laser. The structure and phase transition properties of the samples were studied by Raman spectroscopy and X‐ray diffraction. Raman spectroscopic study reveals that zirconium tungstate solidifies with an orthorhombic structure. This is attributed to the pressure encountered by the samples during rapid solidification. Several Raman bands change discontinuously at about 390 K, indicating a phase transition from the γ‐ to the α‐phase occurring at this temperature. In the β‐phase, most of the Raman modes give rise to negative Grüneisen parameters, suggesting contribution of the corresponding optical phonons to the negative thermal expansion coefficient of the material, at least for the β‐phase. A recovery of the γ‐phase was observed when the samples were cooled to room temperature. This suggests that the cubic structure is metastable only at temperatures above 390 K, and at room temperature the γ‐phase is preferred. Copyright © 2007 John Wiley & Sons, Ltd." @default.
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- W2079188545 date "2007-05-14" @default.
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- W2079188545 title "Raman spectroscopic study on the structure, phase transition and restoration of zirconium tungstate blocks synthesized with a CO2 laser" @default.
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- W2079188545 doi "https://doi.org/10.1002/jrs.1750" @default.
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