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Showing 1–9 of 9 results
Advanced filters: Author: Ikuya Sakurai Clear advanced filters

  • Perovskites are cost-effective and efficient catalysts for electrocatalytic oxygen evolution, however often lack stability. Here, the authors report a tetravalent iron based quadruple perovskite which is both active and stable, due to the covalent bonding network incorporating many of its iron and copper ions.

    • Shunsuke Yagi
    • Ikuya Yamada
    • Shigeo Mori
    ResearchOpen Access
    Nature Communications
    Volume: 6, P: 1-6

  • Signatures of impact-induced shocks are found on Ryugu returned particles. Observations show that they happened at moderate temperatures (~500 °C) and pressures (~2 GPa) and did not dehydrate the particles substantially, suggesting that bigger meteoroids, rather than micrometeoroids, provide Earth with hydrated minerals.

    • Naotaka Tomioka
    • Akira Yamaguchi
    • Yuichi Tsuda
    ResearchOpen Access
    Nature Astronomy
    Volume: 7, P: 669-677

  • Oxygen isotopic measurements from the Ryugu returned sample suggest that primitive hydrated carbonaceous chondrites are an important source of early water and other volatiles to Earth, despite being underrepresented in our meteorite collection due to their preferential destruction during atmospheric entry.

    • Richard C. Greenwood
    • Ian A. Franchi
    • Yuichi Tsuda
    ResearchOpen Access
    Nature Astronomy
    Volume: 7, P: 29-38

  • The sample taken from carbonaceous asteroid Ryugu and brought back to Earth by the Hayabusa2 spacecraft contains outer Solar System-derived materials uncontaminated by terrestrial processes. Even CI carbonaceous chondrites, despite their closeness to solar abundances, are not pristine.

    • Motoo Ito
    • Naotaka Tomioka
    • Yuichi Tsuda
    ResearchOpen Access
    Nature Astronomy
    Volume: 6, P: 1163-1171

  • The aqueous activity responsible for carbonate formation on Ryugu happened much earlier—less than 1.8 million years after CAI formation—than estimates (4–6 Myr) from carbonaceous chondrite meteorites. Ryugu’s parent body either was smaller than ∼20 km in diameter or was disrupted before reaching the high temperatures required.

    • Kaitlyn A. McCain
    • Nozomi Matsuda
    • Yuichi Tsuda
    Research
    Nature Astronomy
    Volume: 7, P: 309-317

  • Ryugu is more primitive than carbonaceous chondrites, according to elevated noble gas concentrations. Elevated Xe and its isotopic composition further provide constraints on fractionation of the solar composition to form the early planetary components.

    • Alexander B. Verchovsky
    • Feargus A. J. Abernethy
    • Nozomi Matsuda
    ResearchOpen Access
    Nature Communications
    Volume: 15, P: 1-11