Magnesite, siderite and ferromagnesites Mg1-xFexCO3(x = 0.05, 0.09, 0.2, 0.4) were characterized using in situ Raman spectroscopy at high pressures up to 55 GPa. For the Mg-Fe-carbonates, the Raman peak positions of six modes (T, L, ν4, ν1, ν3and 2ν2) in the dependence of iron content in the carbonates at ambient conditions are presented. High-pressure Raman spectroscopy shows that siderite undergoes a spin transition at ~40 GPa. The examination of the solid solutions with compositions Mg0.6Fe0.4CO3, Mg0.8Fe0.2CO3, Mg0.91Fe0.09CO3and Mg0.95Fe0.05CO3indicates that with increase in the amount of the Fe spin transition pressure increases up to ~45 GPa.
Spivak, A., Solopova, N., Cerantola, V., Bykova, E., Zakharchenko, E., Dubrovinsky, L., et al. (2014). Raman study of MgCO3-FeCO3 carbonate solid solution at high pressures up to 55 GPa. PHYSICS AND CHEMISTRY OF MINERALS, 41(8), 633-638 [10.1007/s00269-014-0676-y].
Raman study of MgCO3-FeCO3 carbonate solid solution at high pressures up to 55 GPa
Cerantola V;
2014
Abstract
Magnesite, siderite and ferromagnesites Mg1-xFexCO3(x = 0.05, 0.09, 0.2, 0.4) were characterized using in situ Raman spectroscopy at high pressures up to 55 GPa. For the Mg-Fe-carbonates, the Raman peak positions of six modes (T, L, ν4, ν1, ν3and 2ν2) in the dependence of iron content in the carbonates at ambient conditions are presented. High-pressure Raman spectroscopy shows that siderite undergoes a spin transition at ~40 GPa. The examination of the solid solutions with compositions Mg0.6Fe0.4CO3, Mg0.8Fe0.2CO3, Mg0.91Fe0.09CO3and Mg0.95Fe0.05CO3indicates that with increase in the amount of the Fe spin transition pressure increases up to ~45 GPa.
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