Materials Data on Co2TcO4 by Materials Project

Abstract

TcCo2O4 is Spinel-like structured and crystallizes in the orthorhombic Imma space group. The structure is three-dimensional. Tc4+ is bonded to six O2- atoms to form TcO6 octahedra that share corners with six equivalent CoO4 tetrahedra, edges with two equivalent TcO6 octahedra, and edges with four equivalent CoO6 octahedra. There are two shorter (2.02 Å) and four longer (2.07 Å) Tc–O bond lengths. There are two inequivalent Co2+ sites. In the first Co2+ site, Co2+ is bonded to four O2- atoms to form CoO4 tetrahedra that share corners with six equivalent TcO6 octahedra and corners with six equivalent CoO6 octahedra. The corner-sharing octahedra tilt angles range from 53–63°. There is two shorter (1.97 Å) and two longer (1.99 Å) Co–O bond length. In the second Co2+ site, Co2+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with six equivalent CoO4 tetrahedra, edges with two equivalent CoO6 octahedra, and edges with four equivalent TcO6 octahedra. There are four shorter (2.06 Å) and two longer (2.22 Å) Co–O bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a rectangular see-saw-like geometry to two equivalent Tc4+ and two Co2+ atoms. In the second O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Tc4+ and three Co2+ atoms.