Abstract
A new layered perovskite oxyhydride Ba2YHO3 was synthesized via high pressure synthesis. Powder X-ray and neutron diffraction experiments revealed that in Ba2YHO3 the ordered H- and O2- anions form [Ba2H2] rock-salt layers wherein H- conduction is allowed. The conductivity reached 0.1 mS cm-1 at 350 °C, which is higher than that of isostructural Ba2ScHO3 with anion-disordered [Ba2HO] layers.
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