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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Na2Cu2TeO6 by Materials Project

Na2Cu2TeO6 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Na1+ is bonded to six O2- atoms to form distorted NaO6 octahedra that share corners with two equivalent TeO6 octahedra, edges with two equivalent TeO6 octahedra, and edges with three equivalent NaO6 octahedra. The corner-sharing octahedral tilt angles are 15°. There are a spread of Na–O bond distances ranging from 2.32–2.53 Å. Cu2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Cu–O bond distances ranging from 1.99–2.65 Å. Te6+ is bonded to six O2- atoms to form TeO6 octahedra that share corners with four equivalent NaO6 octahedra and edges with four equivalent NaO6 octahedra. The corner-sharing octahedral tilt angles are 15°. There is four shorter (1.95 Å) and two longer (2.03 Å) Te–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Na1+, two equivalent Cu2+, and one Te6+ atom to form a mixture of distorted edge and corner-sharing ONa2Cu2Te trigonal bipyramids. In the second O2- site, O2- is bonded to two equivalent Na1+, two equivalent Cu2+, and one Te6+ atom to form a mixture of distorted edge and corner-sharing ONa2Cu2Te square pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na4CuTe2O29 by Materials Project

Na4CuTe2O29 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are two inequivalent Na sites. In the first Na site, Na is bonded to eight O atoms to form distorted NaO8 hexagonal bipyramids that share corners with two equivalent NaO8 hexagonal bipyramids, a cornercorner with one TeO5 square pyramid, corners with three equivalent ONaCuTeO tetrahedra, edges with two equivalent NaO8 hexagonal bipyramids, and an edgeedge with one TeO5 square pyramid. There are a spread of Na–O bond distances ranging from 2.38–2.65 Å. In the second Na site, Na is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Na–O bond distances ranging from 2.36–2.95 Å. Cu is bonded in a square co-planar geometry to four O atoms. There is two shorter (1.91 Å) and two longer (2.01 Å) Cu–O bond length. Te is bonded to five O atoms to form distorted TeO5 square pyramids that share a cornercorner with one NaO8 hexagonal bipyramid and an edgeedge with one NaO8 hexagonal bipyramid. There are a spread of Te–O bond distances ranging from 2.05–2.38 Å. There are fifteen inequivalent O sites. In the first O site, O is bonded in a linear geometry to two equivalent O atoms. Both O–O bond lengths are 1.78 Å. In the second O site, O is bonded in a single-bond geometry to one O atom. The O–O bond length is 1.23 Å. In the third O site, O is bonded to one Na, one Cu, one Te, and one O atom to form distorted ONaCuTeO tetrahedra that share corners with three equivalent NaO8 hexagonal bipyramids and a cornercorner with one ONaCuTeO tetrahedra. The O–O bond length is 1.40 Å. In the fourth O site, O is bonded in a distorted trigonal non-coplanar geometry to one Cu, one Te, and one O atom. The O–O bond length is 1.36 Å. In the fifth O site, O is bonded in a 3-coordinate geometry to one Na, one Te, and one O atom. The O–O bond length is 1.34 Å. In the sixth O site, O is bonded in a single-bond geometry to one O atom. The O–O bond length is 1.26 Å. In the seventh O site, O is bonded in a 3-coordinate geometry to one Na, one Te, and one O atom. The O–O bond length is 1.47 Å. In the eighth O site, O is bonded in a distorted bent 120 degrees geometry to one Te and one O atom. In the ninth O site, O is bonded in a 3-coordinate geometry to two Na and one O atom. In the tenth O site, O is bonded in a trigonal non-coplanar geometry to two Na and one O atom. In the eleventh O site, O is bonded in a distorted rectangular see-saw-like geometry to three equivalent Na and one O atom. In the twelfth O site, O is bonded in a bent 150 degrees geometry to one Na and one O atom. In the thirteenth O site, O is bonded in a 3-coordinate geometry to one Na and two O atoms. In the fourteenth O site, O is bonded in a 3-coordinate geometry to two equivalent Na and one O atom. The O–O bond length is 1.27 Å. In the fifteenth O site, O is bonded in a distorted L-shaped geometry to one Na and one O atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na4CuTe2O29 by Materials Project

Na4CuTe2O25(O2)2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional and consists of two hydrogen peroxide molecules and one Na4CuTe2O25 framework. In the Na4CuTe2O25 framework, there are two inequivalent Na sites. In the first Na site, Na is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Na–O bond distances ranging from 2.24–2.88 Å. In the second Na site, Na is bonded in a 5-coordinate geometry to six O atoms. There are a spread of Na–O bond distances ranging from 2.27–2.83 Å. Cu is bonded in a square co-planar geometry to four O atoms. There is two shorter (1.90 Å) and two longer (1.91 Å) Cu–O bond length. Te is bonded in a distorted water-like geometry to three O atoms. There are a spread of Te–O bond distances ranging from 1.83–2.51 Å. There are thirteen inequivalent O sites. In the first O site, O is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na and two equivalent O atoms. Both O–O bond lengths are 1.83 Å. In the second O site, O is bonded in a 1-coordinate geometry to one Na, one Cu, and one O atom. The O–O bond length is 1.32 Å. In the third O site, O is bonded in a distorted trigonal planar geometry to one Cu, one Te, and one O atom. The O–O bond length is 1.34 Å. In the fourth O site, O is bonded in a water-like geometry to one Na and one O atom. The O–O bond length is 1.26 Å. In the fifth O site, O is bonded in a single-bond geometry to one O atom. The O–O bond length is 1.26 Å. In the sixth O site, O is bonded in a bent 120 degrees geometry to one Na and one Te atom. In the seventh O site, O is bonded in a bent 120 degrees geometry to one Na and one Te atom. In the eighth O site, O is bonded in a bent 120 degrees geometry to one Na and one O atom. In the ninth O site, O is bonded in a trigonal planar geometry to two Na and one O atom. In the tenth O site, O is bonded in a distorted see-saw-like geometry to three equivalent Na and one O atom. In the eleventh O site, O is bonded in a 3-coordinate geometry to one Na and two O atoms. In the twelfth O site, O is bonded in a distorted water-like geometry to one Na and one O atom. The O–O bond length is 1.24 Å. In the thirteenth O site, O is bonded in a single-bond geometry to one O atom.

36 MATERIALS SCIENCE↗