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Showing 1–7 of 7 results
Advanced filters: Author: Georgios Aprilis 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

  • Using in situ high pressure measurements, the structure and density of a sulfide phase with the formula Fe4+xS3 have been determined. The thermal stability of this phase makes it a potential candidate to form a Martian inner core.

    • Lianjie Man
    • Xiang Li
    • Daniel. J. Frost
    ResearchOpen Access
    Nature Communications
    Volume: 16, P: 1-9

  • 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

  • Aromatic polynitrogen units can display both high stability and high energy content. A hexazine anion has now been identified in a complex compound, K9N56, which is formed at high pressures and temperatures under laser-heating in a diamond anvil cell. The [N6]4− ring is planar and proposed to be aromatic.

    • Dominique Laniel
    • Florian Trybel
    • Natalia Dubrovinskaia
    Research
    Nature Chemistry
    Volume: 15, P: 641-646

  • 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.

    • Ekaterina S. Kiseeva
    • Nester Korolev
    • Leonid Dubrovinsky
    ResearchOpen Access
    Nature Communications
    Volume: 13, P: 1-8

  • 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

  • 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