A New High-Pressure Modification of Nb2O5

✍ Scribed by I.P. Zibrov; V.P. Filonenko; P.-E. Werner; B.-O. Marinder; M. Sundberg

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 473 KB
• Volume: 141
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1998.7954

✦ Synopsis

The transformation of H-Nb 2 O 5 has been studied by using a ''toroid''-type high-pressure chamber at pressures of 5.0 and 8.0 GPa in the temperature region 800-1400°C. A mixture of B-Nb 2 O 5 and a new modification of niobium pentoxide (denoted Z-Nb 2 O 5 ) with seven-coordinated niobium was found in the samples after treatment at P ‫؍‬ 8.0 GPa, T ‫؍‬ 800-1100°C for 1-10 min. The structure was determined and refined by the Rietveld method from X-ray powder diffraction data. The thermogravimetric analysis showed no reduction of the sample.