Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10629752 | Journal of the European Ceramic Society | 2012 | 8 Pages |
Abstract
High pressure-temperature (P-T) phases of the ZrxHf1âxO2 (x = 0.5) solid-solution have been stabilised in a CO2 laser heated diamond anvil cell. At room-temperature the monoclinic to orthorhombic-I structural transformation is initiated at 5-8 GPa. The X-ray diffraction (XRD) studies show these two phases coexist to above â¼15 GPa. A progressive increase in the orthorhombic-I phase abundance occurs, to culminate in full conversion at â¼20 GPa. At this lower threshold of â¼20 GPa transformation to the orthorhombic-II (cotunnite) structure can be initiated by heating in the range of 600-1200 °C. Substantial conversion to the cotunnite phase occurs in the same temperature range at 25-30 GPa. Raman signatures have been assigned to the two orthorhombic high-pressure phases, aided by the qualitative assessment of the complementary XRD data. Decompression experiments show that phase mixture composites of these high pressure structures, possibly with enhanced tribological properties, can be recovered to ambient conditions.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Neil R. Jackson, Rudolph M. Erasmus, David G. Billing, Giovanni R. Hearne,