May 1995 issue
The structure of CeMo8O14 contains an equal mixture of cis-edge-sharing and trans bicapped octahedral Mo8 clusters arranged in layers. The oxygen framework derives from close-packed layers with the sequence ABAC. The Ce3+ ions are surrounded by 12 O atoms forming a distorted cuboctahedron.
The structure of the pyrochlore Y2Ru2O7 was determined by Rietveld analysis of time-of-flight neutron powder diffraction data. Each Ru atom has a nearly regular octahedral coordination environment whereas each Y atom has distorted eightfold coordination geometry.
The structure of K3Nb3O6Si2O7 is built up from Si2O7 ditetrahedra and groups of three corner-linked NbO6 octahedra. The framework is isotypic with that of Ba3Nb6O12(Si2O7)2, but the filling of the tunnels with K+ ions rather than Ba2+ ions determines the space group to be P\=62c.