Zobrazeno 1 - 10
of 323
pro vyhledávání: '"Catherine Mccammon"'
Autor:
Xiang Li, Elena Bykova, Denis Vasiukov, Georgios Aprilis, Stella Chariton, Valerio Cerantola, Maxim Bykov, Susanne Müller, Anna Pakhomova, Fariia I. Akbar, Elena Mukhina, Innokenty Kantor, Konstantin Glazyrin, Davide Comboni, Aleksandr I. Chumakov, Catherine McCammon, Leonid Dubrovinsky, Carmen Sanchez-Valle, Ilya Kupenko
Publikováno v:
Communications Physics, Vol 7, Iss 1, Pp 1-11 (2024)
Abstract Fe1-x O, although chemically simple, possesses a complex structural and magnetic phase diagram. The crystal structures of Fe1-x O and its magnetic properties at extreme conditions are still a matter of debate. Here, we performed a systematic
Externí odkaz:
https://doaj.org/article/b9639a1fb4d54ae792fda326107c270c
Autor:
Mingkai Ma, Peter Overvest, Arjan Hijlkema, Stefan Mangold, Catherine McCammon, Andreas Voegelin, Thilo Behrends
Publikováno v:
Chemical Engineering Journal Advances, Vol 16, Iss , Pp 100565- (2023)
Excess phosphorus abundance often drives eutrophication and affects surface water quality. Formation of vivianite (Fe3(PO4)2 • 8H2O) in aquatic sediments acts as a significant sink for phosphate (P), crucial for resorting surface waters. Authigenic
Externí odkaz:
https://doaj.org/article/9c8474fc6f514123a0ae4bf69a94e5e5
Autor:
Iuliia Koemets, Biao Wang, Egor Koemets, Takayuki Ishii, Zhaodong Liu, Catherine McCammon, Artem Chanyshev, Tomo Katsura, Michael Hanfland, Alexander Chumakov, Leonid Dubrovinsky
Publikováno v:
Frontiers in Chemistry, Vol 11 (2023)
Silicate perovskite, with the mineral name bridgmanite, is the most abundant mineral in the Earth’s lower mantle. We investigated crystal structures and equations of state of two perovskite-type Fe3+-rich phases, FeMg0.5Si0.5O3 and Fe0.5Mg0.5Al0.5S
Externí odkaz:
https://doaj.org/article/b9c1d2c3990c4077a16bfd10673d05eb
Autor:
Ekaterina S. Kiseeva, Nester Korolev, Iuliia Koemets, Dmitry A. Zedgenizov, Richard Unitt, Catherine McCammon, Alena Aslandukova, Saiana Khandarkhaeva, Timofey Fedotenko, Konstantin Glazyrin, Dimitrios Bessas, Georgios Aprilis, Alexandr I. Chumakov, Hiroyuki Kagi, Leonid Dubrovinsky
Publikováno v:
Nature Communications, Vol 13, Iss 1, Pp 1-8 (2022)
This article reports finding of a highly oxidised mineral in diamond inclusion derived from mantle transition zone or lower mantle, very reduced areas on our planet. Such oxidised material is likely linked to subduction of carbonates into this region
Externí odkaz:
https://doaj.org/article/98ad76fba008458183c424969d24d1dd
Publikováno v:
Geophysical Research Letters, Vol 50, Iss 14, Pp n/a-n/a (2023)
Abstract We have carried out in situ high‐pressure acoustic velocity measurements of (Fe2+, Al)‐bearing MgSiO3 glass up to pressures of 155 GPa, which confirmed a distinct pressure‐induced trend change in the transverse acoustic velocity (VS) p
Externí odkaz:
https://doaj.org/article/f00911545c534fe9b90ae8e3bc3a8180
Autor:
Stella Chariton, Maxim Bykov, Elena Bykova, Egor Koemets, Timofey Fedotenko, Björn Winkler, Michael Hanfland, Vitali B. Prakapenka, Eran Greenberg, Catherine McCammon, Leonid Dubrovinsky
Publikováno v:
Acta Crystallographica Section E: Crystallographic Communications, Vol 76, Iss 5, Pp 715-719 (2020)
The crystal structure of MgCO3-II has long been discussed in the literature where DFT-based model calculations predict a pressure-induced transition of the carbon atom from the sp2 to the sp3 type of bonding. We have now determined the crystal struct
Externí odkaz:
https://doaj.org/article/41cec21e3b534f68a328154bd174c847
Publikováno v:
Nature Communications, Vol 10, Iss 1, Pp 1-10 (2019)
The authors here perform experiments to investigate the dihedral angle of olivine-H2O and olivine-H2O-NaCl systems. The observed effect of NaCl to decrease dihedral angles allows fluids to percolate through forearc mantle wedge and to accumulate in t
Externí odkaz:
https://doaj.org/article/b22cc7d2a9ed4b008e02540cbfc80d36
Publikováno v:
Frontiers in Earth Science, Vol 9 (2021)
Molecular hydrogen (H2) released during serpentinization of mantle rocks is one of the main fuels for chemosynthetic life. Processes of H2 production at slow-spreading mid-ocean ridges (MORs) have received much attention in the past. Less well unders
Externí odkaz:
https://doaj.org/article/d2eebafe03084328b7e681c6fb6a28dd
Autor:
Sergey V. Ovsyannikov, Maxim Bykov, Elena Bykova, Konstantin Glazyrin, Rudra Sekhar Manna, Alexander A. Tsirlin, Valerio Cerantola, Ilya Kupenko, Alexander V. Kurnosov, Innokenty Kantor, Anna S. Pakhomova, Irina Chuvashova, Aleksandr I. Chumakov, Rudolf Rüffer, Catherine McCammon, Leonid S. Dubrovinsky
Publikováno v:
Nature Communications, Vol 9, Iss 1, Pp 1-11 (2018)
The charge order transition of commonly known magnetite has only recently been unraveled. Here, the measurement of the low-temperature high-pressure phase diagram of a related material (Fe4O5) elucidates the interplay of average oxidation state and c
Externí odkaz:
https://doaj.org/article/001b75cacfa74f56b513f450e93f57b6
Autor:
Valerio Cerantola, Elena Bykova, Ilya Kupenko, Marco Merlini, Leyla Ismailova, Catherine McCammon, Maxim Bykov, Alexandr I. Chumakov, Sylvain Petitgirard, Innokenty Kantor, Volodymyr Svitlyk, Jeroen Jacobs, Michael Hanfland, Mohamed Mezouar, Clemens Prescher, Rudolf Rüffer, Vitali B. Prakapenka, Leonid Dubrovinsky
Publikováno v:
Nature Communications, Vol 8, Iss 1, Pp 1-9 (2017)
Carbonates are shown to exist in the lower mantle as seen in diamond inclusions, but thermodynamic constraints are poorly understood. Here, the authors synthesise two new iron carbonate compounds and find that self-oxidation-reduction reactions can p
Externí odkaz:
https://doaj.org/article/a79c8bed1e1f4228b309b4cf46722b2c