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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on NaGdTiO4 by Materials Project

NaGdTiO4 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Na1+ is bonded to five equivalent O2- atoms to form a mixture of distorted edge and corner-sharing NaO5 square pyramids. There are one shorter (2.32 Å) and four longer (2.65 Å) Na–O bond lengths. Gd3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Gd–O bond distances ranging from 2.22–2.69 Å. Ti4+ is bonded in a 5-coordinate geometry to six O2- atoms. There are a spread of Ti–O bond distances ranging from 1.77–2.58 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to five equivalent Gd3+ and one Ti4+ atom. In the second O2- site, O2- is bonded to five equivalent Na1+ and one Ti4+ atom to form a mixture of distorted edge and corner-sharing ONa5Ti octahedra. The corner-sharing octahedral tilt angles are 7°. In the third O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Gd3+ and two equivalent Ti4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaGdTiO4 by Materials Project

NaGdTiO4 crystallizes in the orthorhombic Pbcm space group. The structure is three-dimensional. Na1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Na–O bond distances ranging from 2.32–2.90 Å. Gd3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Gd–O bond distances ranging from 2.23–2.72 Å. Ti4+ is bonded in a 5-coordinate geometry to six O2- atoms. There are a spread of Ti–O bond distances ranging from 1.76–2.56 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Gd3+ and two equivalent Ti4+ atoms to form distorted edge-sharing OGd2Ti2 tetrahedra. In the second O2- site, O2- is bonded in a 6-coordinate geometry to two equivalent Na1+, two equivalent Gd3+, and two equivalent Ti4+ atoms. In the third O2- site, O2- is bonded in a 2-coordinate geometry to four equivalent Gd3+ and one Ti4+ atom. In the fourth O2- site, O2- is bonded in a 6-coordinate geometry to five equivalent Na1+ and one Ti4+ atom.

36 MATERIALS SCIENCE↗