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Banaev MV, Sagatova DN, Sagatov NE, Gavryushkin PN. Pb 2[C 2O 6]- P3̄ m1: new insights into the high-pressure behavior of carbonates. Phys Chem Chem Phys 2024; 26:13070-13077. [PMID: 38628084 DOI: 10.1039/d4cp00395k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
In the present study, based on density functional theory and crystal structure prediction approaches, we found a new high-pressure structure of lead carbonate, named Pb2[C2O6]-P3̄m1. This structure differs significantly from previously known modifications of lead carbonate. The Pb2[C2O6]-P3̄m1 structure is characterized by the presence of ethane-like [C2O6] groups, which can also be classified as orthooxalate groups. This structure is most energetically favorable at pressures above 92 GPa at low temperatures, while Pmmn (post-aragonite structure) is most favorable below this pressure. As temperature increases to 2000 K, the pressure required for the Pmmn → P3̄m1 phase transition increases to 100 GPa. The high-pressure modification Pb2[C2O6]-P3̄m1 retains its stability at least up to 200 GPa. In addition, the Raman spectrum of the newly discovered modification was calculated, which may be useful for subsequent identification of this phase in high-pressure experiments. At 100 GPa, the most intense band located at 1148 cm-1 corresponds to the symmetric stretching mode of the C-C bond in the [C2O6] orthooxalate groups. The second and third most intense modes appear at 1021 and 726 cm-1, correspondingly.
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Affiliation(s)
- Maksim V Banaev
- Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk, 630090, Russia.
- Novosibirsk State University, Novosibirsk, 630090, Russia.
| | - Dinara N Sagatova
- Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk, 630090, Russia.
| | - Nursultan E Sagatov
- Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk, 630090, Russia.
- Novosibirsk State University, Novosibirsk, 630090, Russia.
| | - Pavel N Gavryushkin
- Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk, 630090, Russia.
- Novosibirsk State University, Novosibirsk, 630090, Russia.
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Wang XX, Song T, Lei ZS, Sun XW, Tian JH, Liu ZJ. Study of high-pressure thermophysical properties of orthocarbonate Sr 3CO 5 using deep learning molecular dynamics simulations. Phys Chem Chem Phys 2024; 26:6351-6361. [PMID: 38315085 DOI: 10.1039/d3cp04833k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
The exploration of the physical attributes of the recently discovered orthocarbonate Sr3CO5 is significant for comprehending the carbon cycle and storage mechanisms within the Earth's interior. In this study, first-principles calculations are initially used to examine the structural phase transitions of Sr3CO5 polymorphs within the range of lower mantle pressures. The results suggest that Sr3CO5 with the Cmcm phase exhibits a minimal enthalpy between 8.3 and 30.3 GPa. As the pressure exceeds 30.3 GPa, the Cmcm phase undergoes a transition to the I4/mcm phase, while the experimentally observed Pnma phase remains metastable under our studied pressure. Furthermore, the structural data of SrO, SrCO3, and Sr3CO5 polymorphs are utilized to develop a deep learning potential model suitable for the Sr-C-O system, and the pressure-volume relationship and elastic constants calculated using the potential model are in line with the available results. Subsequently, the elastic properties of Cmcm and I4/mcm phases in Sr3CO5 at high temperature and pressure are calculated using the molecular dynamics method. The results indicate that the I4/mcm phase exhibits higher temperature sensitivity in terms of elastic moduli and wave velocities compared to the Cmcm phase. Finally, the thermodynamic properties of the Cmcm and I4/mcm phases are predicted in the range of 0-2000 K and 10-120 GPa, revealing that the heat capacity and bulk thermal expansion coefficient of both phases increase with temperature, with the constant volume heat capacity gradually approaching the Dulong-Petit limit as the temperature rises.
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Affiliation(s)
- Xin-Xuan Wang
- School of Mathematics and Physics, Lanzhou Jiaotong University, Lanzhou 730070, China.
| | - Ting Song
- School of Mathematics and Physics, Lanzhou Jiaotong University, Lanzhou 730070, China.
| | - Zhen-Shuai Lei
- Faculty of Science, Wuhan University of Technology, Wuhan 430079, China
| | - Xiao-Wei Sun
- School of Mathematics and Physics, Lanzhou Jiaotong University, Lanzhou 730070, China.
| | - Jun-Hong Tian
- School of Mathematics and Physics, Lanzhou Jiaotong University, Lanzhou 730070, China.
| | - Zi-Jiang Liu
- School of Mathematics and Physics, Lanzhou Jiaotong University, Lanzhou 730070, China.
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Wang H, Liu L, Gao Z, Yang L, Naren G, Mao S. Structure and elasticity of CaC 2O 5 suggests carbonate contribution to the seismic anomalies of Earth's mantle. Nat Commun 2024; 15:755. [PMID: 38272879 PMCID: PMC10811330 DOI: 10.1038/s41467-024-44925-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Accepted: 01/05/2024] [Indexed: 01/27/2024] Open
Abstract
Knowledge of carbonate compounds under high pressure inside Earth is key to understanding the internal structure of the Earth, the deep carbon cycle and major geological events. Here we use first-principles simulations to calculate the structure and elasticity of CaC2O5-minerals with different symmetries under high pressure. Our calculations show that CaC2O5-minerals represent a group of low-density low-seismic-wave velocity mantle minerals. Changes in seismic wave velocity caused by the phase transformation of CaC2O5-Cc to CaC2O5-I[Formula: see text]2d (CaC2O5-C2-l) agree with wave velocity discontinuity at a depth of 660 km in the mantle transition zone. Moreover, when CaC2O5-Fdd2 transforms into CaC2O5-C2 under 70 GPa, its shear wave velocity decreases by 7.4%, and its density increases by 5.8%, which is consistent with the characteristics of large low-shear-velocity provinces (LLSVPs). Furthermore, the shear wave velocity of CaC2O5-I[Formula: see text]2d is very similar to that of cubic Ca-perovskite, which is one of the main constituents of the previously detected LLSVPs. Therefore, we propose that CaC2O5 and its high-pressure polymorphs may be a main component of LLSVPs.
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Affiliation(s)
- Hanyu Wang
- State Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Sciences and Resources, China University of Geosciences, 100083, Beijing, China
- United Laboratory of High-Pressure Physics and Earthquake Science, Institute of Earthquake Forecasting, China Earthquake Administration, 100036, Beijing, China
| | - Lei Liu
- United Laboratory of High-Pressure Physics and Earthquake Science, Institute of Earthquake Forecasting, China Earthquake Administration, 100036, Beijing, China.
| | - Zihan Gao
- United Laboratory of High-Pressure Physics and Earthquake Science, Institute of Earthquake Forecasting, China Earthquake Administration, 100036, Beijing, China
| | - Longxing Yang
- State Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Sciences and Resources, China University of Geosciences, 100083, Beijing, China
- United Laboratory of High-Pressure Physics and Earthquake Science, Institute of Earthquake Forecasting, China Earthquake Administration, 100036, Beijing, China
| | - Gerile Naren
- United Laboratory of High-Pressure Physics and Earthquake Science, Institute of Earthquake Forecasting, China Earthquake Administration, 100036, Beijing, China
| | - Shide Mao
- State Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Sciences and Resources, China University of Geosciences, 100083, Beijing, China.
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Sagatova DN, Gavryushkin PN, Sagatov NE, Banaev MV. Crystal structures and P-T phase diagrams of SrC 2 O 5 and BaC 2 O 5 . J Comput Chem 2023; 44:2453-2460. [PMID: 37610074 DOI: 10.1002/jcc.27210] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 08/03/2023] [Accepted: 08/04/2023] [Indexed: 08/24/2023]
Abstract
In this study, we present the results of a search for new stable structures of SrC2 O5 and BaC2 O5 in the pressure range of 0-100 GPa based on the density functional theory and crystal structure prediction approaches. We have shown that the recently synthesized pyrocarbonate structure SrC2 O5 - P 2 1 / c is thermodynamically stable for both SrC2 O5 and BaC2 O5 . Thus, SrC2 O5 - P 2 1 / c is stable relative to decomposition reaction above 10 GPa, while the lower-pressure stability limit for BaC2 O5 - P 2 1 / c is 5 GPa, which is the lowest value for the formation of pyrocarbonates. For SrC2 O5 , the following polymorphic transitions were found with increasing pressure: P 2 1 / c → F d d 2 at 40 GPa and 1000 K, F d d 2 → C 2 at 90 GPa and 1000 K. SrC2 O5 - F d d 2 and SrC2 O5 - C 2 are characterized by the framework and layered structures of [CO4 ]4 - tetrahedra, respectively. For BaC2 O5 , with increasing pressure, decomposition of BaC2 O5 - P 2 1 / c into BaCO3 and CO2 is observed at 34 GPa without any polymorphic transitions.
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Affiliation(s)
- Dinara N Sagatova
- Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia
- Department of Geology and Geophysics, Novosibirsk State University, Novosibirsk, Russia
| | - Pavel N Gavryushkin
- Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia
- Department of Geology and Geophysics, Novosibirsk State University, Novosibirsk, Russia
| | - Nursultan E Sagatov
- Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia
- Department of Geology and Geophysics, Novosibirsk State University, Novosibirsk, Russia
| | - Maksim V Banaev
- Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia
- Department of Geology and Geophysics, Novosibirsk State University, Novosibirsk, Russia
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Spahr D, Bayarjargal L, Haussühl E, Luchitskaia R, Friedrich A, Milman V, Fedotenko T, Winkler B. Twisted [C 2O 5] 2--groups in Ba[C 2O 5] pyrocarbonate. Chem Commun (Camb) 2023; 59:11951-11954. [PMID: 37747265 DOI: 10.1039/d3cc03324d] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/26/2023]
Abstract
The inorganic pyrocarbonate salt Ba[C2O5] contains twisted pyrocarbonate anions ([C2O5]2-), an atomic arrangement previously not observed in other pyrocarbonates. This unexpected additional structural degree of freedom points towards an enlarged chemical variability in this novel group of compounds. Ba[C2O5] was synthesized in a laser-heated diamond anvil cell at 30(2) GPa by heating a mixture of Ba[CO3] + CO2 to ≈ 1500(200) K. Its crystal structure was solved from single crystal synchrotron X-ray diffraction data and confirmed by density functional theory-based calculations. The two planar [CO3]2--groups of the [C2O5]2--anion are strongly twisted around the bridging oxygen atom. Ba[C2O5] has been observed in the pressure range of 5-30 GPa, where its symmetry is P6/m with Z = 12.
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Affiliation(s)
- Dominik Spahr
- Goethe University Frankfurt, Institute of Geosciences, Altenhöferallee 1, Frankfurt 60438, Germany.
| | - Lkhamsuren Bayarjargal
- Goethe University Frankfurt, Institute of Geosciences, Altenhöferallee 1, Frankfurt 60438, Germany.
| | - Eiken Haussühl
- Goethe University Frankfurt, Institute of Geosciences, Altenhöferallee 1, Frankfurt 60438, Germany.
| | - Rita Luchitskaia
- Goethe University Frankfurt, Institute of Geosciences, Altenhöferallee 1, Frankfurt 60438, Germany.
| | - Alexandra Friedrich
- University of Würzburg, Institute of Inorganic Chemistry, Am Hubland, Würzburg 97074, Germany
| | - Victor Milman
- Dassault Systèmes BIOVIA, 334 Cambridge Science Park, Cambridge CB4 0WN, UK
| | | | - Björn Winkler
- Goethe University Frankfurt, Institute of Geosciences, Altenhöferallee 1, Frankfurt 60438, Germany.
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