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The Raman and luminescence spectra of GdVO 4:Eu 3+ microcrystals have been measured in the pressure range from ambient pressure to 16.4 GPa at room temperature by using a diamond anvil cell. The discontinuities on Raman mode and luminescence intensity and the appearance of new Raman bands and luminescence peaks have provided strong evidence for a phase transition at 7.4 GPa from zircon-type to scheelite-type structure, and the zircon-type and scheelite-type phases coexist over a pressure range of 7.4−16.4 GPa. The scheelite-type phase is retained after release of pressure.
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Zhang et al. (2010) studied this question.
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