Scheelite CaWO 4 at high pressures

Titelangaben

Grzechnik, Andrzej ; Crichton, Wilson A. ; Hanfland, Michael ; van Smaalen, Sander:
Scheelite CaWO 4 at high pressures.
In: Journal of Physics: Condensed Matter. Bd. 15 (2003) Heft 43 . - S. 7261-7270.
ISSN 1361-648X
DOI: https://doi.org/10.1088/0953-8984/15/43/010

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Abstract

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.