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- Title
High-Pressure Behavior of Ferromagnesite (Mg<sub>0.81</sub>Fe<sub>0.19</sub>)CO<sub>3</sub> by Synchrotron X-Ray Diffraction and Raman Spectroscopy up to 53 GPa.
- Authors
Liang, Lin; Zhang, Guibin; Huang, Shengxuan; Niu, Jingjing; Zhang, Dongzhou; Xu, Jingui; Liang, Wen; Qin, Shan
- Abstract
Ferromagnesite (Mg, Fe)CO3 with 20 mol% iron is a potential host mineral for carbon transport and storage in the Earth mantle. The high-pressure behavior of synthetic ferromagnesite (Mg0.81Fe0.19)CO3 up to 53 GPa was investigated by synchrotron X-ray diffraction (XRD) and Raman spectroscopy. The iron bearing carbonate underwent spin transition at around 44–46 GPa accompanied by a volume collapse of 1.8%, which also demonstrated a variation in the dνi/dP slope of the Raman modes. The pressure-volume data was fitted by a third-order Birch-Murnaghan equation of state (BM-EoS) for the high spin phase. The best-fit K0 = 108(1) GPa and K0′ = 4.2(1). Combining the dνi/dP and the K0, the mode Grüneisen parameters of each vibrational mode (T, L, ν4 and ν1) were calculated. The effects of iron concentration on the Mg1−xFexCO3 system related to high-pressure compressibility and vibrational properties are discussed. These results expand the knowledge of the physical properties of carbonates and provide insights to the potential deep carbon host.
- Subjects
RAMAN spectroscopy; X-ray diffraction; SYNCHROTRONS; EARTH'S mantle; SPIN crossover; IRON
- Publication
Journal of Earth Science, 2024, Vol 35, Issue 2, p525
- ISSN
1674-487X
- Publication type
Article
- DOI
10.1007/s12583-021-1495-y