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Chernov ED, Dyachenko AA, Lukoyanov AV. Effect of Doping on the Electronic Structure of the Earth’s Lower Mantle Compounds: FeXO3 with X = C, Al, Si. MATERIALS 2022; 15:ma15031080. [PMID: 35161025 PMCID: PMC8838980 DOI: 10.3390/ma15031080] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 01/26/2022] [Accepted: 01/28/2022] [Indexed: 12/04/2022]
Abstract
The effect of the mutual doping of C, Si, and Al atoms on the electronic structure and magnetic properties of FeXO3 (X = C, Al, Si) compounds, which are constituent compounds of the Earth’s lower mantle, was studied. In our first principles calculations, it was found that doping with carbon for both FeSiO3 and FeAlO3 leads to the transition of the compound from a half-metallic state to a metallic one. The values of the magnetic moments of Fe were obtained for pure and doped compounds. For the doped compounds, there is a tendency of the Fe magnetic moment to increase with the growth in the number of substituted ions in the case of replacing Si with C and Si for Al; on the contrary, in the case of replacing Al with C and Si, a decrease in the magnetic moment was revealed. For FeXO3 (X = C, Al, Si), the obtained magnetic moment values were found to be in a good agreement with the known experimental data.
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Affiliation(s)
- Evgeniy D. Chernov
- M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620108 Ekaterinburg, Russia; (E.D.C.); (A.A.D.)
- Institute of Physics and Technology, Ural Federal University, Mira, 19, 620002 Ekaterinburg, Russia
| | - Alexey A. Dyachenko
- M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620108 Ekaterinburg, Russia; (E.D.C.); (A.A.D.)
- Skolkovo Institute of Science and Technology, 121205 Moscow, Russia
| | - Alexey V. Lukoyanov
- M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620108 Ekaterinburg, Russia; (E.D.C.); (A.A.D.)
- Institute of Physics and Technology, Ural Federal University, Mira, 19, 620002 Ekaterinburg, Russia
- Skolkovo Institute of Science and Technology, 121205 Moscow, Russia
- Correspondence: ; Tel.: +7-343-378-3886
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Phase Stability and Vibrational Properties of Iron-Bearing Carbonates at High Pressure. MINERALS 2020. [DOI: 10.3390/min10121142] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The spin transition of iron can greatly affect the stability and various physical properties of iron-bearing carbonates at high pressure. Here, we reported laser Raman measurements on iron-bearing dolomite and siderite at high pressure and room temperature. Raman modes of siderite FeCO3 were investigated up to 75 GPa in the helium (He) pressure medium and up to 82 GPa in the NaCl pressure medium, respectively. We found that the electronic spin-paring transition of iron in siderite occurred sharply at 42–44 GPa, consistent with that in the neon (Ne) pressure medium in our previous study. This indicated that the improved hydrostaticity from Ne to He had minimal effects on the spin transition pressure. Remarkably, the spin crossover of siderite was broadened to 38–48 GPa in the NaCl pressure medium, due to the large deviatoric stress in the sample chamber. In addition, Raman modes of iron-bearing dolomite Ca1.02Mg0.76Fe0.20Mn0.02(CO3)2 were explored up to 58 GPa by using argon as a pressure medium. The sample underwent phase transitions from dolomite-Ⅰ to -Ⅰb phase at ~8 GPa, and then to -Ⅱ at ~15 and -Ⅲb phase at 36 GPa, while no spin transition was observed in iron-bearing dolomite up to 58 GPa. The incorporation of FeCO3 by 20 mol% appeared to marginally decrease the onset pressures of the three phase transitions aforementioned for pure dolomite. At 55–58 GPa, the ν1 mode shifted to a lower frequency at ~1186 cm−1, which was likely associated with the 3 + 1 coordination in dolomite-Ⅲb. These results shed new insights into the nature of iron-bearing carbonates at high pressure.
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Weis C, Sternemann C, Cerantola V, Sahle CJ, Spiekermann G, Harder M, Forov Y, Kononov A, Sakrowski R, Yavaş H, Tolan M, Wilke M. Pressure driven spin transition in siderite and magnesiosiderite single crystals. Sci Rep 2017; 7:16526. [PMID: 29184152 PMCID: PMC5705641 DOI: 10.1038/s41598-017-16733-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Accepted: 10/11/2017] [Indexed: 11/09/2022] Open
Abstract
Iron-bearing carbonates are candidate phases for carbon storage in the deep Earth and may play an important role for the Earth's carbon cycle. To elucidate the properties of carbonates at conditions of the deep Earth, we investigated the pressure driven magnetic high spin to low spin transition of synthetic siderite FeCO3 and magnesiosiderite (Mg0.74Fe0.26)CO3 single crystals for pressures up to 57 GPa using diamond anvil cells and x-ray Raman scattering spectroscopy to directly probe the iron 3d electron configuration. An extremely sharp transition for siderite single crystal occurs at a notably low pressure of 40.4 ± 0.1 GPa with a transition width of 0.7 GPa when using the very soft pressure medium helium. In contrast, we observe a broadening of the transition width to 4.4 GPa for siderite with a surprising additional shift of the transition pressure to 44.3 ± 0.4 GPa when argon is used as pressure medium. The difference is assigned to larger pressure gradients in case of argon. For magnesiosiderite loaded with argon, the transition occurs at 44.8 ± 0.8 GPa showing similar width as siderite. Hence, no compositional effect on the spin transition pressure is observed. The spectra measured within the spin crossover regime indicate coexistence of regions of pure high- and low-spin configuration within the single crystal.
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Affiliation(s)
- Christopher Weis
- Fakultät Physik/DELTA, Technische Universität Dortmund, Dortmund, 44227, Germany.
| | - Christian Sternemann
- Fakultät Physik/DELTA, Technische Universität Dortmund, Dortmund, 44227, Germany
| | - Valerio Cerantola
- European Synchrotron Radiation Facility, 71 Avenue des Martyrs, Grenoble, 38000, France
| | - Christoph J Sahle
- European Synchrotron Radiation Facility, 71 Avenue des Martyrs, Grenoble, 38000, France
| | - Georg Spiekermann
- Institute of Earth and Environmental Science, Universität Potsdam, Potsdam, 14476, Germany.,Deutsches Elektronen-Synchrotron DESY, Hamburg, 22607, Germany
| | - Manuel Harder
- Deutsches Elektronen-Synchrotron DESY, Hamburg, 22607, Germany
| | - Yury Forov
- Fakultät Physik/DELTA, Technische Universität Dortmund, Dortmund, 44227, Germany
| | - Alexander Kononov
- Fakultät Physik/DELTA, Technische Universität Dortmund, Dortmund, 44227, Germany
| | - Robin Sakrowski
- Fakultät Physik/DELTA, Technische Universität Dortmund, Dortmund, 44227, Germany
| | - Hasan Yavaş
- Deutsches Elektronen-Synchrotron DESY, Hamburg, 22607, Germany
| | - Metin Tolan
- Fakultät Physik/DELTA, Technische Universität Dortmund, Dortmund, 44227, Germany
| | - Max Wilke
- Institute of Earth and Environmental Science, Universität Potsdam, Potsdam, 14476, Germany
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