Raman Study of High Pressure Phases of MgCr2O4 and FeCr2O4
Abstract
High pressure phases of MgCr2O4 and FeCr2O4 could be found in planetary interiors as well as meteorites. Although X-ray diffraction studies had provided several useful information about the structures and stabilities of these phases, spectroscopic data for these high pressure polymorphs are still not available yet. In addition, Raman data of the high pressure phases of MgCr2O4 and FeCr2O4 could be regarded as a powerful tool for phase identifications in an efficient way. Furthermore, high pressure Raman study of the CaTi2O4-type structure of MgCr2O4 would be important for serving as a pressure gauge for planetary sciences. In this study, we synthesized the high pressure phases of MgCr2O4 and FeCr2O4 using a large volume pressure in the pressure range of 16-20 GPa and temperature of 1000-1600 0C. The synthesized phases were examined by a custom-built Raman system with a wavelength of 514.5 nm. In this presentation, we report the new Raman spectra of modified Ludwigite phase, CaFe2O4-type and CaTi2O4-type of MgCr2O4 and FeCr2O4. Furthermore, we also report the high pressure Raman study of post CaTi2O4-type phase of MgCr2O4 to 61 GPa.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2016
- Bibcode:
- 2016AGUFMMR21B2635S
- Keywords:
-
- 3909 Elasticity and anelasticity;
- MINERAL PHYSICSDE: 3924 High-pressure behavior;
- MINERAL PHYSICSDE: 3939 Physical thermodynamics;
- MINERAL PHYSICSDE: 3630 Experimental mineralogy and petrology;
- MINERALOGY AND PETROLOGY