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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Tb2Se2O7 by Materials Project

Tb2Se2O7 is Zircon-like structured and crystallizes in the tetragonal P4_2/ncm space group. The structure is three-dimensional. Tb3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Tb–O bond distances ranging from 2.27–2.54 Å. Se4+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. All Se–O bond lengths are 1.74 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to four equivalent Tb3+ atoms to form edge-sharing OTb4 tetrahedra. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Tb3+ and one Se4+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Tb3+ and one Se4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tb2SeO2 by Materials Project

Tb2O2Se crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Tb3+ is bonded in a 4-coordinate geometry to three equivalent Se2- and four equivalent O2- atoms. All Tb–Se bond lengths are 3.00 Å. There are one shorter (2.30 Å) and three longer (2.31 Å) Tb–O bond lengths. Se2- is bonded to six equivalent Tb3+ atoms to form distorted SeTb6 octahedra that share corners with twelve equivalent OTb4 tetrahedra, edges with six equivalent SeTb6 octahedra, and edges with six equivalent OTb4 tetrahedra. O2- is bonded to four equivalent Tb3+ atoms to form OTb4 tetrahedra that share corners with six equivalent SeTb6 octahedra, corners with six equivalent OTb4 tetrahedra, edges with three equivalent SeTb6 octahedra, and edges with three equivalent OTb4 tetrahedra. The corner-sharing octahedra tilt angles range from 27–48°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tb2SeO2 by Materials Project

Tb2O2Se crystallizes in the orthorhombic Pnnm space group. The structure is three-dimensional. Tb3+ is bonded in a 4-coordinate geometry to four equivalent Se2- and four equivalent O2- atoms. There are two shorter (3.19 Å) and two longer (3.50 Å) Tb–Se bond lengths. There are a spread of Tb–O bond distances ranging from 2.23–2.26 Å. Se2- is bonded in a 8-coordinate geometry to eight equivalent Tb3+ atoms. O2- is bonded to four equivalent Tb3+ atoms to form a mixture of corner and edge-sharing OTb4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tb2SeO2 by Materials Project

Tb2O2Se crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Tb3+ is bonded in a 4-coordinate geometry to four equivalent Se2- and four equivalent O2- atoms. All Tb–Se bond lengths are 3.33 Å. All Tb–O bond lengths are 2.24 Å. Se2- is bonded in a body-centered cubic geometry to eight equivalent Tb3+ atoms. O2- is bonded to four equivalent Tb3+ atoms to form a mixture of corner and edge-sharing OTb4 tetrahedra.

36 MATERIALS SCIENCE↗