title: Structure of RbFeO2, refined from a reticular pseudomerohedrally twinned crystal with six domains.
abstract: RbFeO(2), rubidium oxoferrate, crystallizes as an orthorhombic structure. The crystals under investigation were composed of six individuals representing reticular pseudomerohedral twins with a pseudocubic twin lattice of index 4 because of the approximate equations a(8)(1/2) = b(2)(1/2) = c. The compound is isostructural with KFeO(2) (KGaO(2) type of structure) and is composed of [FeO(4/2)](-) corner-sharing tetrahedra, forming a three-dimensional cristobalite-like network, with Rb(+) ions occupying its interstices.
authors.affiliation: Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Nuss
authors.forename: Naveed Zafar
authors.initials: NZ
authors.lastname: Ali
authors.forename: Martin
authors.initials: M
authors.lastname: Jansen