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Showing 1–13 of 13 results
Advanced filters: Author: Anna Pakhomova Clear advanced filters

  • Beryllium in inorganic compounds is usually coordinated to four oxygen atoms, but higher coordination numbers have been predicted. Here the authors observe a pressure induced stepwise transition in CaBe2P2O8 where Be coordination changes to trigonal-bipyramidal and octahedral, implying that d orbitals are not mandatory for high coordination.

    • Anna Pakhomova
    • Georgios Aprilis
    • Leonid Dubrovinsky
    ResearchOpen Access
    Nature Communications
    Volume: 10, P: 1-6

  • Feldspars are stable at pressures up to 3 GPa along the mantle geotherm, but they can persist metastably at higher pressures at colder conditions. Here, above 10 GPa the authors find  new high-pressure polymorphs of feldspars that could persist at depths corresponding to the Earth’s upper mantle, potentially influencing the dynamics and fate of cold subducting slabs.

    • Anna Pakhomova
    • Dariia Simonova
    • Leonid Dubrovinsky
    ResearchOpen Access
    Nature Communications
    Volume: 11, P: 1-8

  • Under the pressure of a watery ocean, rock-forming minerals might dissolve at a planet’s rock–water interface, generating a denser-than-water layer that should be incorporated into models. The experimental data for MgO presented here are relevant to water-rich Earth-sized planets such as TRAPPIST-1 c and f, and to Uranus.

    • Taehyun Kim
    • Stella Chariton
    • Yongjae Lee
    Research
    Nature Astronomy
    Volume: 5, P: 815-821

  • High pressure experiments may yield materials with unusual combinations of properties, but typically in small amounts and unstable. Here the authors synthesize millimeter-sized samples of metallic, ultraincompressible and very hard rhenium nitride pernitride, recoverable at ambient conditions.

    • Maxim Bykov
    • Stella Chariton
    • Leonid Dubrovinsky
    ResearchOpen Access
    Nature Communications
    Volume: 10, P: 1-8

  • 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 charge-ordering phenomena in the iron oxide family.

    • Sergey V. Ovsyannikov
    • Maxim Bykov
    • Leonid S. Dubrovinsky
    ResearchOpen Access
    Nature Communications
    Volume: 9, P: 1-11

  • Geochemically relevant [C4O10]4- pyramids are the most polymerized high pressure carbonate units, with Mn-, Cd-, Ca- and Ba-based structures reported to date. Here, the authors synthesized an Fe-carbonate featuring [C4O10]4- anions with a predicted high-to-low-spin crossover at unusually high pressure near 95 GPa.

    • Valentin Kovalev
    • Dominik Spahr
    • Elena Bykova
    ResearchOpen Access
    Communications Chemistry
    Volume: 8, P: 1-11

  • This work concerns a systematic study of Fe1-xO employing complementary methods of powder and single-crystal X-ray diffraction and synchrotron Mössbauer source spectroscopy up to 94 GPa and 1700 K. It presents a structural and magnetic transitional pressure-temperature diagram of Fe1-xO and demonstrates the complex physicochemical properties of simple Fe1-xO binary oxide under extreme conditions.

    • Xiang Li
    • Elena Bykova
    • Ilya Kupenko
    ResearchOpen Access
    Communications Physics
    Volume: 7, P: 1-11

  • Structural studies of pyrene, a polycyclic aromatic hydrocarbon, have so far been limited to below 2 GPa. Here, studying the crystal structure of pyrene up to ~35 GPa using in situ single-crystal synchrotron X-ray diffraction in diamond anvil cells, the authors discover two previously unobserved polymorphs, and find that gradual compression results in continuous compaction of molecular packing, eventually leading to a curvature of the molecules.

    • Wenju Zhou
    • Yuqing Yin
    • Natalia Dubrovinskaia
    ResearchOpen Access
    Communications Chemistry
    Volume: 7, P: 1-12