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Formation of Na 0.9 Mo 6 O 17 in a Solid-Phase Process. Transformations of a Hydrated Sodium Molybdenum Bronze, Na 0.23 (H 2 O) 0.78 MoO 3 , with Heat Treatments in a Nitrogen Atmosphere

1991; Oxford University Press; Volume: 64; Issue: 1 Linguagem: Inglês

10.1246/bcsj.64.161

1348-0634

Kazuo Eda, Kouichi Furusawa, Fumikazu Hatayama, Sadao Takagi, Noriyuki Sotani,

Catalytic Processes in Materials Science

Abstract The transformations of hydrated sodium molybdenum bronze, Na0.23(H2O)0.78MoO3, with heat treatments in a nitrogen atmosphere are as follows: Na0.23(H2O)0.78MoO3 (AD) \xrightarrowat 330 K Na0.23(H2O)0.5MoO3 (VD) \xrightarrowat 457 K Na0.23MoO3 (with VD structure) \xrightarrowat 583 K Na0.9Mo6O17 + small amount of other materials \xrightarrowat 800 and 900 Kmeit. This indicates a new and variable formation process of alkali metal molybdenum bronzes. In this process, Na0.9Mo6O17 was formed in the solid phase without the formation of any intermediate products. Its formation temperature was about 600 K, which was less than those of the usual preparation methods by about 200 K.