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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Eu2SeO2 by Materials Project

Eu2SeO2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Eu3+ is bonded in a 4-coordinate geometry to three equivalent Se2- and four equivalent O2- atoms. All Eu–Se bond lengths are 3.11 Å. There are three shorter (2.34 Å) and one longer (2.38 Å) Eu–O bond lengths. Se2- is bonded in a 6-coordinate geometry to six equivalent Eu3+ atoms. O2- is bonded to four equivalent Eu3+ atoms to form a mixture of edge and corner-sharing OEu4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu2SeO2 by Materials Project

Eu2SeO2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Eu3+ is bonded in a 4-coordinate geometry to four equivalent Se2- and four equivalent O2- atoms. All Eu–Se bond lengths are 3.43 Å. All Eu–O bond lengths are 2.29 Å. Se2- is bonded in a body-centered cubic geometry to eight equivalent Eu3+ atoms. O2- is bonded to four equivalent Eu3+ atoms to form a mixture of edge and corner-sharing OEu4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on EuSeO4 by Materials Project

EuSeO4 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Eu2+ is bonded to six O2- atoms to form EuO6 octahedra that share corners with six equivalent SeO4 tetrahedra and edges with two equivalent EuO6 octahedra. There are two shorter (2.44 Å) and four longer (2.53 Å) Eu–O bond lengths. Se6+ is bonded to four O2- atoms to form SeO4 tetrahedra that share corners with six equivalent EuO6 octahedra. The corner-sharing octahedra tilt angles range from 44–56°. There is two shorter (1.68 Å) and two longer (1.72 Å) Se–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Eu2+ and one Se6+ atom. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Eu2+ and one Se6+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on EuSeO4 by Materials Project

EuSeO4 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Eu2+ is bonded in a 8-coordinate geometry to nine O2- atoms. There are a spread of Eu–O bond distances ranging from 2.54–3.11 Å. Se6+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of Se–O bond distances ranging from 1.69–1.71 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Eu2+ and one Se6+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to three equivalent Eu2+ and one Se6+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Eu2+ and one Se6+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Eu2+ and one Se6+ atom.

36 MATERIALS SCIENCE↗