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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on KNO2 by Materials Project

KNO2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. K1+ is bonded in a hexagonal planar geometry to six O2- atoms. There are a spread of K–O bond distances ranging from 2.81–2.96 Å. N3+ is bonded in a bent 120 degrees geometry to two O2- atoms. Both N–O bond lengths are 1.27 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to three equivalent K1+ and one N3+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to three equivalent K1+ and one N3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KNO2 by Materials Project

KNO2 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. K1+ is bonded in a 6-coordinate geometry to six equivalent O2- atoms. There are a spread of K–O bond distances ranging from 2.82–2.91 Å. N3+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. Both N–O bond lengths are 1.27 Å. O2- is bonded in a 4-coordinate geometry to three equivalent K1+ and one N3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KNO2 by Materials Project

KNO2 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. K1+ is bonded in a 6-coordinate geometry to six equivalent O2- atoms. There are a spread of K–O bond distances ranging from 2.80–2.94 Å. N3+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. Both N–O bond lengths are 1.28 Å. O2- is bonded in a 1-coordinate geometry to three equivalent K1+ and one N3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KNO2 by Materials Project

KNO2 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. K1+ is bonded in a 6-coordinate geometry to six equivalent O2- atoms. There are a spread of K–O bond distances ranging from 2.82–2.92 Å. N3+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. Both N–O bond lengths are 1.28 Å. O2- is bonded to three equivalent K1+ and one N3+ atom to form a mixture of distorted edge and corner-sharing OK3N tetrahedra.

36 MATERIALS SCIENCE↗
NASA NTRS1976

Erosion and the rocks of Venus

Photographs of the surface of Venus returned by the Venera 9 and 10 spacecraft have revealed the presence of smooth and angular rockline forms. Two mechanisms previously suggested (Sagan, 1975) for erosion of crater ramparts on the surface of Venus might also explain the erosion of rocks. Chemical weathering by the hydrochloric, hydrofluoric, and sulfuric acids present in the atmosphere of Venus may have been sufficient to erode angular projections of silicous rocks. Alternatively, the contours of rocks containing such low-melting materials as NaOH, KOH, HgS and KNO2 may have softened as the result of exposure to the high surface temperatures of the planet.

Sagan, C.↗