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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on KSbO3 by Materials Project

KSbO3 crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. K1+ is bonded in a hexagonal planar geometry to six equivalent O2- atoms. All K–O bond lengths are 2.68 Å. Sb5+ is bonded to six equivalent O2- atoms to form corner-sharing SbO6 octahedra. The corner-sharing octahedral tilt angles are 44°. All Sb–O bond lengths are 2.02 Å. O2- is bonded in a 4-coordinate geometry to two equivalent K1+ and two equivalent Sb5+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KSbO3 by Materials Project

KSbO3 is Ilmenite structured and crystallizes in the trigonal R-3 space group. The structure is three-dimensional. K1+ is bonded in a 6-coordinate geometry to six equivalent O2- atoms. There are three shorter (2.62 Å) and three longer (2.96 Å) K–O bond lengths. Sb5+ is bonded to six equivalent O2- atoms to form edge-sharing SbO6 octahedra. There are three shorter (2.03 Å) and three longer (2.04 Å) Sb–O bond lengths. O2- is bonded in a 3-coordinate geometry to two equivalent K1+ and two equivalent Sb5+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KSbO3 by Materials Project

KSbO3 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. K1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of K–O bond distances ranging from 2.50–2.86 Å. Sb5+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Sb–O bond distances ranging from 1.88–2.49 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to three equivalent K1+ and one Sb5+ atom to form OK3Sb tetrahedra that share corners with five OK3Sb tetrahedra, corners with six equivalent OKSb3 trigonal pyramids, and edges with three OK3Sb tetrahedra. In the second O2- site, O2- is bonded to one K1+ and three equivalent Sb5+ atoms to form distorted OKSb3 trigonal pyramids that share corners with eleven OK3Sb tetrahedra, corners with two equivalent OKSb3 trigonal pyramids, an edgeedge with one OKSb2O tetrahedra, and edges with two equivalent OKSb3 trigonal pyramids. In the third O2- site, O2- is bonded to one K1+, two equivalent Sb5+, and one O2- atom to form distorted OKSb2O tetrahedra that share corners with three equivalent OK3Sb tetrahedra, corners with five equivalent OKSb3 trigonal pyramids, edges with two OK3Sb tetrahedra, and an edgeedge with one OKSb3 trigonal pyramid. The O–O bond length is 1.48 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KSbO3 by Materials Project

KSbO3 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. K1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of K–O bond distances ranging from 2.71–2.95 Å. Sb5+ is bonded to five O2- atoms to form edge-sharing SbO5 square pyramids. There are a spread of Sb–O bond distances ranging from 2.07–2.12 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 5-coordinate geometry to three equivalent K1+ and two equivalent Sb5+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent K1+ and two equivalent Sb5+ atoms. In the third O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent K1+, one Sb5+, and one O2- atom. The O–O bond length is 1.48 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KSbO3 by Materials Project

KSbO3 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. K1+ is bonded in a distorted pentagonal planar geometry to five O2- atoms. There are a spread of K–O bond distances ranging from 2.60–2.99 Å. Sb5+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Sb–O bond distances ranging from 1.89–2.42 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a rectangular see-saw-like geometry to three equivalent K1+ and one Sb5+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one K1+ and two equivalent Sb5+ atoms. In the third O2- site, O2- is bonded in a 4-coordinate geometry to one K1+, two equivalent Sb5+, and one O2- atom. The O–O bond length is 1.46 Å.

36 MATERIALS SCIENCE↗
NASA NTRS1975

Research for preparation of cation-conducting solids by high-pressure synthesis and other methods

It was shown that two body-centered-cubic skeleton structures, the Im3 KSbO3 phase and the defect-pyrochlore phase A(+)B2X6, do exhibit fast Na(+)-ion transport. The placement of anions at the tunnel intersection sites does not impede Na(+)-ion transport in (NaSb)3)(1/6 NaF), and may not in (Na(1+2x)Ta2 5F)(Ox). The activation energies are higher than those found in beta-alumina. There are two possible explanations for the higher activation energy: breathing of the bottleneck (site face or edge) through which the A(+) ions must pass on jumping from one site to another may be easier in a layer structure and/or A(+)-O bonding may be stronger in the cubic structures because the O(2-) ion bonds with two (instead of three) cations of the skeleton. If the former explanation is dominant, a lower activation energy may be achieved by optimizing the lattice parameter. If the latter is dominant, a new structural principle may have to be explored.

Goodenough, J. B.↗
NASA NTRS1976

Fast Na/+/-ion transport in skeleton structures

The skeleton structures considered in the investigations consist of a rigid subarray with an interconnected interstitial space in which ions move in three dimensions. The classes of skeleton structures investigated include the Im3 phase of high-pressure KSbO3, the defect-pyrochlore structure illustrated by RbMgAlF6, and the carnegieite structure of high-temperature NaAlSiO4. A description is given of the results obtained in transport measurements involving dense polycrystalline ceramic disks. Results obtained in the case of the Na(+)-ion transport in Na3Zr2PSi2O12 appear particularly promising concerning the possible use of such substances in solid-electrolyte applications.

Goodenough, J. B.↗