April 2001 issue
Lithium manganese oxide crystals with composition (Li0.91Mn0.09)Mn2O4 were synthesized by a flux method. The crystals have a structure closely related to that of the cubic spinel LiMn2O4, but 9% of the lithium ions in the tetrahedral 4a site are substituted by Mn2+ ions. This substitution lowers the average Mn oxidation state below 3.5+, resulting in a Jahn–Teller distortion of the MnO6 octahedron.
Rubidium molybdenum selenide crystallizes in the trigonal space group R. Its crystal structure consists of a mixture of Mo12Se14Se6 and Mo15Se17Se6 cluster units in a 1:2 ratio. Both units are interconnected through Mo—Se bonds. The Rb+ cations occupy large voids between the different cluster units.
Sr3ZnPtO6 and Sr3CdPtO6 crystals were grown from a KOH flux. The isostructural compounds adopt the rhombohedral K4CdCl6 structure type, featuring chains of face-shared ZnO6 or CdO6 trigonal prisms alternating with PtO6 octahedra along . The metal–oxygen polyhedral chains are separated by Sr2+ cations.
The crystal structure of Ba3(AlO4)H is isotypic with Ba3SiS5 and contains AlO45− and H− anions. The hydride and oxide anions are coordinated by six Ba and five Ba/one Al atoms in an octahedral geometry. The hydrogen content was examined by MAS–NMR experiments of the deuterated compound.
The structure of the title compound, consisting of two double crankshaft chains of disordered [(Si,Ge)O4] tetrahedra connected at right angles to each other and forming a framework, has been determined using a synchrotron X-ray source.