Synthesis and structural characterization of novel tin and titanium potassium silicates K4M2Si6O18 (original) (raw)

Journal of Solid State Chemistry, 2003

Abstract

ABSTRACT The synthesis of a new potassium titanosilicate, K4Ti2Si6O18 (Ti–AV-11), possessing the crystal structure of potassium stannosilicate AV-11, has been reported. The unit cell of this material is trigonal, space group R3 (no. 146), Z=3, a=10.012, c=14.8413Å, γ=120°, V=1289Å3. The structure of AV-11 is built up of MO6 (M=Sn, Ti) octahedra and SiO4 tetrahedra by sharing corners. The SiO4 tetrahedra form helix chains, periodically repeating every six tetrahedra. These chains extend along the [001] direction and are linked by isolated MO6 octahedra, thus producing a mixed octahedral–tetrahedral oxide framework. AV-11 materials have been further characterized by bulk chemical analysis, powder X-ray diffraction (XRD), scanning electron microscopy (SEM), 29Si and 119Sn magic-angle spinning (MAS) NMR spectroscopy.

Artur Ferreira hasn't uploaded this paper.

Let Artur know you want this paper to be uploaded.

Ask for this paper to be uploaded.