Figure 1.

Structures of various oxyhydride compounds. For all structures, unit cells are oriented in the same a, b, c direction, as indicated in (a). Hydride is shown by yellow spheres, and oxide by red spheres. For the layered structures, interlayer La and Sr cations are shown by shades of green. For disordered ABO_3–xH_x in (b), the primitive cubic cell seen with BaScO₂H, SrCrO₂H, SrTiO_3–xH_x, and BaTiO_3–xH_x is shown; octahedral tilting is observed for certain Ca-Sr solid solutions (Ca,Sr)TiO_3–xH_x, resulting in larger unit cells (not shown).