The high-pressure room-temperature behaviour of scheelite CaWO 4 ( I 4 1 / a , Z = 4) is studied using high-resolution synchrotron angle-dispersive x-ray powder diffraction in diamond anvil cells loaded with helium or a mixture of methanol and ethanol as the pressure-transmitting media. At about 10 GPa, there occurs a phase transition to the fergusonite type ( I 2/ a , Z = 4) without any discontinuity in the pressure dependence of the unit cell volumes. These observations are discussed in relation to the high-pressure–high-temperature systematics of the AMX 4 and AX 2 type compounds.
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Grzechnik et al. (2003) studied this question.
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