Abstract
ZrW2O8 samples have been prepared from ZrO2 and WO3 precursors by a ceramic method. Different portions of this material were subjected to non cumulative pressure treatments within the 2–65 Kbar range; the metastable high-pressure phase, γ-ZrW2O8, has been isolated by quenching from 6 Kbar. Further pressure increases up to 10 Kbar produced the volume reduction of the γ-phase; a minimum volume was found even after having released the pressure. Otherwise, heating above 600°C, followed by quenching at 77 K leads to the high-temperature phase, β-ZrW2O8, which is stable at room temperature. Finally, when γ-ZrW2O8 was subjected to pressure and temperature, γ-ZrW2O8 could also be quenched with a still larger volume reduction at 6 Kbar and 600°C.
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