Materials Data on NaTi2HO5 by Materials Project
NaTi2HO5 crystallizes in the triclinic P1 space group. The structure is two-dimensional and consists of one NaTi2HO5 sheet oriented in the (0, 0, 1) direction. Na1+ is bonded in a 7-coordinate geometry to two equivalent H1+ and five O2- atoms. There are one shorter (2.47 Å) and one longer (2.58 Å) Na–H bond lengths. There are a spread of Na–O bond distances ranging from 2.38–2.73 Å. There are two inequivalent Ti4+ sites. In the first Ti4+ site, Ti4+ is bonded to six O2- atoms to form a mixture of distorted edge and corner-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles are 38°. There are a spread of Ti–O bond distances ranging from 1.85–2.24 Å. In the second Ti4+ site, Ti4+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ti–O bond distances ranging from 1.84–2.24 Å. H1+ is bonded in a single-bond geometry to two equivalent Na1+ and one O2- atom. The H–O bond length is 0.98 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+ and two equivalent Ti4+ atoms. In the second O2- site, O2- is bonded to four Ti4+ atoms to form a mixture of distorted edge and corner-sharing OTi4 trigonal pyramids. In the third O2- site, O2- is bonded in a distorted single-bond geometry to four equivalent Na1+ and one H1+ atom. In the fourth O2- site, O2- is bonded in a water-like geometry to two equivalent Ti4+ atoms. In the fifth O2- site, O2- is bonded to four Ti4+ atoms to form a mixture of distorted edge and corner-sharing OTi4 trigonal pyramids.