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Full-Text Articles in Physical Sciences and Mathematics
High Pressure And High Temperature Study Of Magnesiochromite And Its Geophysical Implications, N M Tauhid Belal Khan
High Pressure And High Temperature Study Of Magnesiochromite And Its Geophysical Implications, N M Tauhid Belal Khan
Electronic Thesis and Dissertation Repository
Magnesiochromite (MgCr2O4) is commonly found in the Earth’s crust, upper mantle, meteorites, and possibly in lunar crust. Synchrotron X-ray diffraction measurements of MgCr2O4 using double-sided laser heating diamond anvil cell showed the dissociation of MgCr2O4 to Cr2O3+MgO at ~15 GPa and to Mg2Cr2O5+Cr2O3 below and above ~1500 K, respectively. At above 20 GPa, only a single phase CaTi2O4-type structure of MgCr2O4 was observed at 1400-2000 K. Fitting the pressure-volume data …
Chromite Crystal Structure And Chemistry Applied As An Exploration Tool, Patrick H.M. Shepherd
Chromite Crystal Structure And Chemistry Applied As An Exploration Tool, Patrick H.M. Shepherd
Electronic Thesis and Dissertation Repository
The spinel group minerals have long been of interest to the geosciences due to their use as indicator minerals. Unit cell is a structural measure controlled by composition but is also affected by pressure and temperature relations through order-disorder. This study attempted to look at the applications of unit cell in exploration. The implementation of µXRD for this purpose required the creation the Slice Integration Technique to improve signal over background. Compositions of binary spinels can be approximated through their correlation with unit cell. Possible applications include gemology and curatorial studies, where the nondestructive nature of µXRD is highly advantageous …