Physics – Condensed Matter – Materials Science
Scientific paper
2002-09-24
Physics
Condensed Matter
Materials Science
13 pages, 6 figs, submitted to J. Phys: Condensed Matter
Scientific paper
10.1088/0953-8984/15/14/310
The structure of the pseudo-binary mercury chalcogenide alloy HgSe0.7S0.3 has been studied by means of X-ray and neutron powder diffraction at pressures up to 8.5 GPa. A phase transition from the cubic zinc blende structure to the hexagonal cinnabar structure was observed at P ~ 1 GPa. A phenomenological model of this reconstructive phase transition based on the displacement mechanism is proposed. The analysis of the geometrical relationship between the zinc blende and the cinnabar phases has shown that the possible order parameter for the zinc blende - cinnabar structural transformation is the spontaneous strain e4. This assignment agrees with the previously observed high pressure behaviour of the elastic constants of some mercury chalcogenides.
Ehm Lars
Hull Stephen
Knorr Klaus
Kozlenko D. P.
Savenko B. N.
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