ChemInform Abstract: Preparation and Transmission Electron Microscopy Investigation of Quaternary Niobium Tungsten Oxides of Titanium, Zirconium, and Hafnium.

✍ Scribed by F. KRUMEICH; G. LIEDTKE; W. MADER

• Publisher: John Wiley and Sons
• Year: 2010
• Weight: 29 KB
• Volume: 28
• Category: Article
• ISSN: 0931-7597
• DOI: 10.1002/chin.199738002

✦ Synopsis

Preparation and Transmission Electron Microscopy Investigation of Quaternary Niobium Tungsten Oxides of Titanium, Zirconium, and Hafnium.

-Oxides of composition MNb6W10O47 with M: Ti, Zr, Hf and M2Nb4W11O47 (M: Ti, Hf) are prepared for the first time by reaction of the binary oxides at 1000-1400 • C. The compounds are isotypic with the 4:9 phase (Nb8W9O47) and have the threefold tetragonal tungsten bronze ( TTB) type superstructure. However, transmission electron microscopic results for ZrNb6W10O47 reveal the presence of another quaternary phase that exhibits a novel intergrowth structure between the TTB and the ReO3 type.