Materials Data on NaMnO2 by Materials Project

Abstract

NaMnO2 is Caswellsilverite structured and crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Na1+ is bonded to six equivalent O2- atoms to form NaO6 octahedra that share corners with six equivalent MnO6 octahedra, edges with six equivalent NaO6 octahedra, and edges with six equivalent MnO6 octahedra. The corner-sharing octahedra tilt angles range from 10–13°. There are four shorter (2.39 Å) and two longer (2.44 Å) Na–O bond lengths. Mn3+ is bonded to six equivalent O2- atoms to form MnO6 octahedra that share corners with six equivalent NaO6 octahedra, edges with six equivalent NaO6 octahedra, and edges with six equivalent MnO6 octahedra. The corner-sharing octahedra tilt angles range from 10–13°. There are four shorter (1.97 Å) and two longer (2.44 Å) Mn–O bond lengths. O2- is bonded to three equivalent Na1+ and three equivalent Mn3+ atoms to form a mixture of distorted corner and edge-sharing ONa3Mn3 octahedra. The corner-sharing octahedral tilt angles are 0°.