Abstract
AbstractRoom‐temperature high‐pressure behaviour of SrWO4 scheelite (I41/a, Z = 4) has been studied to 20.7 GPa in a diamond anvil cell using synchrotron angle‐dispersive X‐ray powder diffraction. Above 10 GPa, it transforms to the fergusonite structure (I2/a, Z = 4). Both scheelite and fergusonite types are ordered superstructures of fluorite (Fm$ \bar 3 $m, Z = 4). There is no significant volume collapse at the scheelite‐fergusonite phase transition. However, the compression data including both phases of strontium tungstate cannot be fitted by a common Birch–Murnaghan equation of state. An onset of decomposition into component oxides occurs at about 15 GPa. The pressure‐induced transformations are irreversible. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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