Bi1.7V8O16: The First Bi-Hollandite-Type Compound

✍ Scribed by F. Abraham; O. Mentre

• Book ID: 102605496
• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 307 KB
• Volume: 109
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1994.1082

✦ Synopsis

(\mathrm{Bi}{1.7} \mathrm{~V}{8} \mathrm{O}{16}) was synthesized by high temperature solid state reaction between (\mathrm{Bi}{2} \mathrm{O}{3}, \mathrm{~V}{2} \mathrm{O}{5}), and (\mathrm{V}{2} \mathrm{O}{3}). The compound crystallizes with tetragonal symmetry, space group (I 4 / \mathrm{m}). The structure refinement using single crystal data confirms that the compound belongs to the hollandite family. It is the first hollandite-type compound containing bismuth in the large tunnels of the (\mathrm{V}{8} \mathrm{O}{16}) framework. The bismuth atom forms a very flat (\mathrm{BiO}{4}) square pyramid with the skeleton oxygen atoms. (\mathrm{Bi}{1.7} \mathrm{~V}{8} \mathrm{O}{16}) is oxidized to (\mathrm{BiVO}{4}) and (\mathrm{V}{2} \mathrm{O}{5}) at (400^{\circ} \mathrm{C}) in air, as evidenced by TGA and DSC. (1) 1994 Academic Press. Inc.