Results for “Cl-Eu-O-Si” | Engineering Papers

DOE OSTI2020

Materials Data on Eu2SiCl2O3 by Materials Project

Eu2SiO3Cl2 crystallizes in the tetragonal I4/m space group. The structure is three-dimensional. Eu2+ is bonded in a 7-coordinate geometry to four O2- and three Cl1- atoms. There are a spread of Eu–O bond distances ranging from 2.48–2.82 Å. There are a spread of Eu–Cl bond distances ranging from 2.95–2.97 Å. Si4+ is bonded to four O2- atoms to form corner-sharing SiO4 tetrahedra. There is two shorter (1.62 Å) and two longer (1.67 Å) Si–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Eu2+ and two equivalent Si4+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to three equivalent Eu2+ and one Si4+ atom. There are three inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a square co-planar geometry to four equivalent Eu2+ atoms. In the second Cl1- site, Cl1- is bonded in a 2-coordinate geometry to two equivalent Eu2+ atoms. In the third Cl1- site, Cl1- is bonded in a square co-planar geometry to four equivalent Eu2+ atoms.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Eu5Si(Cl3O2)2 by Materials Project

Eu5Si(O2Cl3)2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are three inequivalent Eu2+ sites. In the first Eu2+ site, Eu2+ is bonded in a 9-coordinate geometry to two O2- and seven Cl1- atoms. There are one shorter (2.50 Å) and one longer (2.55 Å) Eu–O bond lengths. There are a spread of Eu–Cl bond distances ranging from 2.94–3.36 Å. In the second Eu2+ site, Eu2+ is bonded in a 8-coordinate geometry to two equivalent O2- and six Cl1- atoms. Both Eu–O bond lengths are 2.50 Å. There are a spread of Eu–Cl bond distances ranging from 2.87–3.23 Å. In the third Eu2+ site, Eu2+ is bonded in a 2-coordinate geometry to three O2- and four Cl1- atoms. There are a spread of Eu–O bond distances ranging from 2.44–2.72 Å. There are a spread of Eu–Cl bond distances ranging from 2.94–3.29 Å. Si4+ is bonded in a tetrahedral geometry to four O2- atoms. There is two shorter (1.64 Å) and two longer (1.65 Å) Si–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to three Eu2+ and one Si4+ atom. In the second O2- site, O2- is bonded to three Eu2+ and one Si4+ atom to form distorted OEu3Si trigonal pyramids that share edges with two equivalent ClEu6 octahedra and an edgeedge with one OEu3Si trigonal pyramid. There are four inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded to six Eu2+ atoms to form distorted ClEu6 octahedra that share corners with two equivalent ClEu6 octahedra and edges with four equivalent OEu3Si trigonal pyramids. The corner-sharing octahedral tilt angles are 25°. In the second Cl1- site, Cl1- is bonded in a 5-coordinate geometry to five Eu2+ atoms. In the third Cl1- site, Cl1- is bonded in a 4-coordinate geometry to four Eu2+ atoms. In the fourth Cl1- site, Cl1- is bonded in a 4-coordinate geometry to four Eu2+ atoms.

36 MATERIALS SCIENCE↗