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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Eu2Si2O7 by Materials Project

Eu2Si2O7 crystallizes in the orthorhombic Pna2_1 space group. The structure is three-dimensional. there are two inequivalent Eu3+ sites. In the first Eu3+ site, Eu3+ is bonded to seven O2- atoms to form distorted EuO7 pentagonal bipyramids that share corners with three equivalent EuO7 pentagonal bipyramids, corners with four SiO4 tetrahedra, edges with two equivalent EuO7 pentagonal bipyramids, and edges with two SiO4 tetrahedra. There are a spread of Eu–O bond distances ranging from 2.32–2.63 Å. In the second Eu3+ site, Eu3+ is bonded to seven O2- atoms to form distorted EuO7 pentagonal bipyramids that share corners with three equivalent EuO7 pentagonal bipyramids, corners with four SiO4 tetrahedra, edges with two equivalent EuO7 pentagonal bipyramids, and edges with two SiO4 tetrahedra. There are a spread of Eu–O bond distances ranging from 2.32–2.63 Å. There are two inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with four EuO7 pentagonal bipyramids, a cornercorner with one SiO4 tetrahedra, and edges with two EuO7 pentagonal bipyramids. There is three shorter (1.63 Å) and one longer (1.68 Å) Si–O bond length. In the second Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with four EuO7 pentagonal bipyramids, a cornercorner with one SiO4 tetrahedra, and edges with two EuO7 pentagonal bipyramids. There are a spread of Si–O bond distances ranging from 1.62–1.67 Å. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two Eu3+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to two Eu3+ and one Si4+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two Eu3+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a trigonal planar geometry to two Eu3+ and one Si4+ atom. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to two Eu3+ and one Si4+ atom. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to two Eu3+ and one Si4+ atom. In the seventh O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two Eu3+ and two Si4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu2SiO4 by Materials Project

Eu2SiO4 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Eu2+ sites. In the first Eu2+ site, Eu2+ is bonded in a 1-coordinate geometry to ten O2- atoms. There are a spread of Eu–O bond distances ranging from 2.37–3.14 Å. In the second Eu2+ site, Eu2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Eu–O bond distances ranging from 2.51–3.09 Å. Si4+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of Si–O bond distances ranging from 1.63–1.67 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to four Eu2+ and one Si4+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to five Eu2+ and one Si4+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to five Eu2+ and one Si4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu2SiO4 by Materials Project

Eu2SiO4 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Eu2+ sites. In the first Eu2+ site, Eu2+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Eu–O bond distances ranging from 2.39–3.00 Å. In the second Eu2+ site, Eu2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Eu–O bond distances ranging from 2.54–2.77 Å. Si4+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of Si–O bond distances ranging from 1.63–1.67 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to four Eu2+ and one Si4+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to four Eu2+ and one Si4+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to four Eu2+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to three Eu2+ and one Si4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on EuSiO3 by Materials Project

EuSiO3 is (Cubic) Perovskite structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Eu2+ is bonded to twelve equivalent O2- atoms to form EuO12 cuboctahedra that share corners with twelve equivalent EuO12 cuboctahedra, faces with six equivalent EuO12 cuboctahedra, and faces with eight equivalent SiO6 octahedra. All Eu–O bond lengths are 2.63 Å. Si4+ is bonded to six equivalent O2- atoms to form SiO6 octahedra that share corners with six equivalent SiO6 octahedra and faces with eight equivalent EuO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Si–O bond lengths are 1.86 Å. O2- is bonded in a distorted linear geometry to four equivalent Eu2+ and two equivalent Si4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu2SiO5 by Materials Project

Eu2SiO5 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Eu3+ sites. In the first Eu3+ site, Eu3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Eu–O bond distances ranging from 2.32–2.73 Å. In the second Eu3+ site, Eu3+ is bonded to seven O2- atoms to form distorted EuO7 hexagonal pyramids that share a cornercorner with one SiO5 trigonal bipyramid, edges with four equivalent EuO7 hexagonal pyramids, and edges with two equivalent SiO5 trigonal bipyramids. There are a spread of Eu–O bond distances ranging from 2.34–2.54 Å. Si4+ is bonded to five O2- atoms to form distorted SiO5 trigonal bipyramids that share a cornercorner with one EuO7 hexagonal pyramid, corners with two equivalent SiO5 trigonal bipyramids, and edges with two equivalent EuO7 hexagonal pyramids. There are a spread of Si–O bond distances ranging from 1.64–1.91 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded to four Eu3+ atoms to form a mixture of edge and corner-sharing OEu4 tetrahedra. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Eu3+ and one Si4+ atom. In the third O2- site, O2- is bonded to three Eu3+ and one Si4+ atom to form distorted OEu3Si tetrahedra that share corners with eight OEu4 tetrahedra and edges with three OEu3Si tetrahedra. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to two Eu3+ and two equivalent Si4+ atoms. In the fifth O2- site, O2- is bonded to three Eu3+ and one Si4+ atom to form distorted OEu3Si tetrahedra that share corners with eight OEu4 tetrahedra and edges with two equivalent OEu3Si tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu2SiO5 by Materials Project

Eu2SiO5 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are two inequivalent Eu3+ sites. In the first Eu3+ site, Eu3+ is bonded to six O2- atoms to form distorted EuO6 octahedra that share corners with four equivalent SiO4 tetrahedra and edges with two equivalent EuO6 octahedra. There are a spread of Eu–O bond distances ranging from 2.30–2.38 Å. In the second Eu3+ site, Eu3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Eu–O bond distances ranging from 2.31–2.72 Å. Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with four equivalent EuO6 octahedra. The corner-sharing octahedra tilt angles range from 42–68°. There are a spread of Si–O bond distances ranging from 1.63–1.66 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to two equivalent Eu3+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Eu3+ and one Si4+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to two Eu3+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to three Eu3+ and one Si4+ atom. In the fifth O2- site, O2- is bonded to four Eu3+ atoms to form distorted edge-sharing OEu4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu5Si3O13 by Materials Project

Eu5Si3O13 crystallizes in the hexagonal P6_3/m space group. The structure is three-dimensional. there are two inequivalent Eu+2.80+ sites. In the first Eu+2.80+ site, Eu+2.80+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Eu–O bond distances ranging from 2.29–2.77 Å. In the second Eu+2.80+ site, Eu+2.80+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Eu–O bond distances ranging from 2.43–2.83 Å. Si4+ is bonded in a tetrahedral geometry to four O2- atoms. There is one shorter (1.63 Å) and three longer (1.65 Å) Si–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to three Eu+2.80+ and one Si4+ atom. In the second O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Eu+2.80+ atoms. In the third O2- site, O2- is bonded in a 1-coordinate geometry to three Eu+2.80+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to three Eu+2.80+ and one Si4+ atom.

36 MATERIALS SCIENCE↗