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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Sr2Ti2O5 by Materials Project

Sr2Ti2O5 crystallizes in the orthorhombic Ima2 space group. The structure is three-dimensional. Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.59–3.08 Å. There are two inequivalent Ti3+ sites. In the first Ti3+ site, Ti3+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with four equivalent TiO6 octahedra and corners with two equivalent TiO4 trigonal pyramids. The corner-sharing octahedral tilt angles are 5°. There are a spread of Ti–O bond distances ranging from 2.00–2.08 Å. In the second Ti3+ site, Ti3+ is bonded to four O2- atoms to form TiO4 trigonal pyramids that share corners with two equivalent TiO6 octahedra and corners with two equivalent TiO4 trigonal pyramids. The corner-sharing octahedral tilt angles are 17°. There is one shorter (1.92 Å) and three longer (1.93 Å) Ti–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to four equivalent Sr2+ and two equivalent Ti3+ atoms to form a mixture of distorted face, edge, and corner-sharing OSr4Ti2 octahedra. The corner-sharing octahedral tilt angles are 0°. In the second O2- site, O2- is bonded in a 6-coordinate geometry to four equivalent Sr2+ and two Ti3+ atoms. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Sr2+ and two equivalent Ti3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr2Ti2O5 by Materials Project

Sr2Ti2O5 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are two inequivalent Sr2+ sites. In the first Sr2+ site, Sr2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Sr–O bond distances ranging from 2.60–3.03 Å. In the second Sr2+ site, Sr2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Sr–O bond distances ranging from 2.60–3.04 Å. There are three inequivalent Ti3+ sites. In the first Ti3+ site, Ti3+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with four equivalent TiO6 octahedra and a cornercorner with one TiO4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 6–8°. There are a spread of Ti–O bond distances ranging from 1.99–2.04 Å. In the second Ti3+ site, Ti3+ is bonded in a rectangular see-saw-like geometry to four O2- atoms. There is two shorter (1.92 Å) and two longer (1.93 Å) Ti–O bond length. In the third Ti3+ site, Ti3+ is bonded to four O2- atoms to form corner-sharing TiO4 trigonal pyramids. The corner-sharing octahedral tilt angles are 15°. There are a spread of Ti–O bond distances ranging from 1.91–1.93 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded to four Sr2+ and two equivalent Ti3+ atoms to form a mixture of distorted corner and edge-sharing OSr4Ti2 octahedra. The corner-sharing octahedral tilt angles are 0°. In the second O2- site, O2- is bonded in a 6-coordinate geometry to four Sr2+ and two equivalent Ti3+ atoms. In the third O2- site, O2- is bonded in a 2-coordinate geometry to four Sr2+ and two Ti3+ atoms. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to four Sr2+ and two Ti3+ atoms. In the fifth O2- site, O2- is bonded in a distorted linear geometry to four Sr2+ and two Ti3+ atoms. In the sixth O2- site, O2- is bonded in a distorted linear geometry to four Sr2+ and two Ti3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr2Ti2O5 by Materials Project

Sr2Ti2O5 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Sr2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Sr–O bond distances ranging from 2.63–3.22 Å. There are two inequivalent Ti3+ sites. In the first Ti3+ site, Ti3+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with four equivalent TiO6 octahedra and corners with two equivalent TiO4 trigonal pyramids. The corner-sharing octahedral tilt angles are 5°. There are a spread of Ti–O bond distances ranging from 1.99–2.05 Å. In the second Ti3+ site, Ti3+ is bonded to four O2- atoms to form TiO4 trigonal pyramids that share corners with two equivalent TiO6 octahedra and corners with two equivalent TiO4 trigonal pyramids. The corner-sharing octahedral tilt angles are 13°. There are a spread of Ti–O bond distances ranging from 1.91–1.93 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to four equivalent Sr2+ and two equivalent Ti3+ atoms. In the second O2- site, O2- is bonded to four equivalent Sr2+ and two equivalent Ti3+ atoms to form a mixture of distorted edge, face, and corner-sharing OSr4Ti2 octahedra. The corner-sharing octahedral tilt angles are 0°. In the third O2- site, O2- is bonded in a 2-coordinate geometry to four equivalent Sr2+ and two Ti3+ atoms.

36 MATERIALS SCIENCE↗