Physics
Scientific paper
Apr 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012pepi..196...75y&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 196, p. 75-82.
Physics
Scientific paper
Pressure-induced phase transition in magnesiochromite (MgCr2O4) was studied by in situ Raman spectroscopy and X-ray diffraction to 50 and 60 GPa, respectively. A polymorphic phase transition from cubic Fd3¯m structure to tetragonal I41/amd structure was observed at pressures above 20 GPa and this transition is complete at 23.5 GPa. The volume data for magnesiochromite fitted to Birch-Murnaghan equation of state (EOS) yield K0 = 189(2) GPa, K0′=7.2(3) and V0 = 578.68(4) Å3, consistent with theoretical calculations. The EOS of the high pressure tetragonal phase was also obtained as K0 = 191(8) GPa and V0 = 279(1) Å3 when K0′ = 4 (fixed). The volume reduction at phase transition is about 4.4%. The high pressure phase is unquenchable and transformed back to magnesiochromite with little hysteresis upon release of pressure.
Botis Sanda
Shi Weiguang
Shieh Sean R.
Withers Anthony C.
Yong Wenjun
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