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