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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on KFe2P2O11 by Materials Project

KFe2P2O11 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. K is bonded in a 6-coordinate geometry to six O atoms. There are a spread of K–O bond distances ranging from 2.73–2.93 Å. There are two inequivalent Fe sites. In the first Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with two equivalent FeO6 octahedra, corners with four PO4 tetrahedra, and an edgeedge with one FeO6 octahedra. The corner-sharing octahedra tilt angles range from 53–54°. There are a spread of Fe–O bond distances ranging from 1.92–2.11 Å. In the second Fe site, Fe is bonded to six O atoms to form distorted FeO6 octahedra that share corners with two equivalent FeO6 octahedra and corners with four PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 53–54°. There are a spread of Fe–O bond distances ranging from 1.94–2.47 Å. There are two inequivalent P sites. In the first P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with four FeO6 octahedra. The corner-sharing octahedra tilt angles range from 37–62°. There are a spread of P–O bond distances ranging from 1.54–1.57 Å. In the second P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with four FeO6 octahedra. The corner-sharing octahedra tilt angles range from 40–52°. All P–O bond lengths are 1.55 Å. There are eleven inequivalent O sites. In the first O site, O is bonded in a distorted bent 120 degrees geometry to one K, one Fe, and one P atom. In the second O site, O is bonded in a 2-coordinate geometry to one K, one Fe, and one P atom. In the third O site, O is bonded in a distorted bent 150 degrees geometry to one Fe and one P atom. In the fourth O site, O is bonded in a 3-coordinate geometry to one K, one Fe, and one P atom. In the fifth 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 sixth O site, O is bonded in a distorted bent 150 degrees geometry to one Fe and one P atom. In the seventh O site, O is bonded in a 3-coordinate geometry to one K, one Fe, and one P atom. In the eighth O site, O is bonded in a distorted trigonal planar geometry to three Fe atoms. In the ninth O site, O is bonded in a 2-coordinate geometry to one K, one Fe, and one P atom. In the tenth O site, O is bonded in a bent 120 degrees geometry to one Fe and one O atom. In the eleventh O site, O is bonded in a 2-coordinate geometry to one K, one Fe, and one P atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KFe2P2O11 by Materials Project

KFe2P2O11 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. K is bonded in a 6-coordinate geometry to six O atoms. There are a spread of K–O bond distances ranging from 2.71–2.97 Å. There are two inequivalent Fe sites. In the first Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with two equivalent FeO6 octahedra, corners with four PO4 tetrahedra, and an edgeedge with one FeO6 octahedra. The corner-sharing octahedra tilt angles range from 51–53°. There are a spread of Fe–O bond distances ranging from 1.99–2.07 Å. In the second Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with two equivalent FeO6 octahedra and corners with four PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 51–53°. There are a spread of Fe–O bond distances ranging from 1.98–2.11 Å. There are two inequivalent P sites. In the first P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with four FeO6 octahedra. The corner-sharing octahedra tilt angles range from 37–62°. There are a spread of P–O bond distances ranging from 1.54–1.57 Å. In the second P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with four FeO6 octahedra. The corner-sharing octahedra tilt angles range from 42–51°. There are a spread of P–O bond distances ranging from 1.54–1.56 Å. There are eleven inequivalent O sites. In the first O site, O is bonded in a distorted bent 120 degrees geometry to one K, one Fe, and one P atom. In the second O site, O is bonded in a 2-coordinate geometry to one K, one Fe, and one P atom. In the third O site, O is bonded in a distorted bent 120 degrees geometry to one Fe and one P atom. In the fourth O site, O is bonded in a 3-coordinate geometry to one K, one Fe, and one P atom. In the fifth O site, O is bonded in a single-bond geometry to one O atom. The O–O bond length is 2.01 Å. In the sixth O site, O is bonded in a distorted bent 150 degrees geometry to one Fe and one P atom. In the seventh O site, O is bonded in a 3-coordinate geometry to one K, one Fe, and one P atom. In the eighth O site, O is bonded in a distorted trigonal planar geometry to three Fe atoms. In the ninth O site, O is bonded in a distorted bent 150 degrees geometry to one K, one Fe, and one P atom. In the tenth O site, O is bonded in a single-bond geometry to one Fe and one O atom. In the eleventh O site, O is bonded in a 2-coordinate geometry to one K, one Fe, and one P atom.

36 MATERIALS SCIENCE↗