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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Na(SeO3)4 by Materials Project

Na(SeO3)4 crystallizes in the monoclinic Pc space group. The structure is one-dimensional and consists of two Na(SeO3)4 ribbons oriented in the (1, 0, 0) direction. Na is bonded to six O atoms to form distorted NaO6 octahedra that share a cornercorner with one SeO4 tetrahedra and an edgeedge with one SeO4 tetrahedra. There are a spread of Na–O bond distances ranging from 2.32–2.90 Å. There are four inequivalent Se sites. In the first Se site, Se is bonded to four O atoms to form SeO4 tetrahedra that share a cornercorner with one NaO6 octahedra and an edgeedge with one NaO6 octahedra. The corner-sharing octahedral tilt angles are 73°. There are a spread of Se–O bond distances ranging from 1.63–1.86 Å. In the second Se site, Se is bonded in a trigonal planar geometry to three O atoms. There is one shorter (1.62 Å) and two longer (1.63 Å) Se–O bond length. In the third Se site, Se is bonded in a trigonal non-coplanar geometry to three O atoms. There are a spread of Se–O bond distances ranging from 1.65–1.85 Å. In the fourth Se site, Se is bonded in a trigonal planar geometry to three O atoms. There is one shorter (1.62 Å) and two longer (1.63 Å) Se–O bond length. There are twelve inequivalent O sites. In the first O site, O is bonded in a bent 150 degrees geometry to one Na and one Se atom. In the second O site, O is bonded in a distorted water-like geometry to one Na and one Se atom. In the third O site, O is bonded in a bent 120 degrees geometry to one Na and one Se atom. In the fourth O site, O is bonded in a single-bond geometry to one Se atom. In the fifth O site, O is bonded in a single-bond geometry to one Se atom. In the sixth O site, O is bonded in a bent 120 degrees geometry to one Na and one Se atom. In the seventh O site, O is bonded in a single-bond geometry to one Se atom. In the eighth O site, O is bonded in a bent 120 degrees geometry to one Na and one Se atom. In the ninth O site, O is bonded in a single-bond geometry to one Se atom. In the tenth O site, O is bonded in a 2-coordinate geometry to one Na and two Se atoms. In the eleventh O site, O is bonded in a single-bond geometry to one Se atom. In the twelfth O site, O is bonded in a single-bond geometry to one Se atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaNbSe2O7 by Materials Project

NaNbO(SeO3)2 crystallizes in the orthorhombic Cmc2_1 space group. The structure is two-dimensional and consists of two NaNbO(SeO3)2 sheets oriented in the (0, 1, 0) direction. Na1+ is bonded in a 4-coordinate geometry to four equivalent O2- atoms. There are two shorter (2.46 Å) and two longer (2.50 Å) Na–O bond lengths. Nb5+ is bonded to six O2- atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles are 40°. There are a spread of Nb–O bond distances ranging from 1.83–2.17 Å. Se4+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. There is one shorter (1.67 Å) and two longer (1.78 Å) Se–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 150 degrees geometry to one Nb5+ and one Se4+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to one Nb5+ and one Se4+ atom. In the third O2- site, O2- is bonded in a trigonal non-coplanar geometry to two equivalent Na1+ and one Se4+ atom. In the fourth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Nb5+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na(SeO3)2 by Materials Project

Na(SeO3)2 crystallizes in the monoclinic Pc space group. The structure is three-dimensional. Na is bonded in a 5-coordinate geometry to five O atoms. There are a spread of Na–O bond distances ranging from 2.32–2.90 Å. There are two inequivalent Se sites. In the first Se site, Se is bonded in a 4-coordinate geometry to four O atoms. There are a spread of Se–O bond distances ranging from 1.65–2.49 Å. In the second Se site, Se is bonded in a tetrahedral geometry to four O atoms. There are a spread of Se–O bond distances ranging from 1.64–1.82 Å. There are six inequivalent O sites. In the first O site, O is bonded in a bent 150 degrees geometry to one Na and one Se atom. In the second O site, O is bonded in a distorted bent 120 degrees geometry to one Na and two Se atoms. In the third O site, O is bonded in a linear geometry to one Na and one Se atom. In the fourth O site, O is bonded in a bent 120 degrees geometry to one Na and one Se atom. In the fifth O site, O is bonded in a distorted single-bond geometry to two Se atoms. In the sixth O site, O is bonded in a bent 150 degrees geometry to one Na and one Se atom.

36 MATERIALS SCIENCE↗