Pressure-stabilized cubic perovskite oxyhydride BaScO2H

Year: 2017 DOI: 10.1021/acs.inorgchem.6b02834

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Yoshihiro Goto, Cédric Tassel, Yasuto Noda, Olivier J. Hernandez, Chris J. Pickard, Mark A. Green, Hikari Sakaebe, Noboru Taguchi, Yoshiharu Uchimoto, Yoji Kobayashi, Hiroshi Kageyama.   Inorganic Chemistry, 2017, 56, 4840-4845.


We report a scandium oxyhydride BaScO2H prepared by solid state reaction under high pressure. Rietveld refinements against powder synchrotron X-ray and neutron diffraction data revealed that BaScO2H adopts the ideal cubic perovskite structure (Pm3̅m), where oxide (O2–) and hydride (H) anions are disordered. 1H nuclear magnetic resonance (NMR) spectroscopy provides a positive chemical shift of about +4.4 ppm, which can be understood by the distance to the nearest (and possibly the next nearest) cation from the H nucleus. A further analysis of the NMR data and calculations based on ab initio random structure searches suggest a partial cis preference in ScO4H2 octahedra. The present oxyhydride, if compositionally or structurally tuned, may become a candidate for H conductors.