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Characterization of Mixed Cobalt‐Molybdenum Oxides Prepared by Evaporative Decomposition of Solutions
Author(s) -
Rossetti George A.,
Burger Joseph L.,
Sisson Richard D.
Publication year - 1989
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1989.tb05983.x
Subject(s) - molybdenum , cobalt , crystallite , decomposition , materials science , isothermal process , metal , inorganic chemistry , tungsten , chemical engineering , chemistry , metallurgy , organic chemistry , thermodynamics , physics , engineering
The synthesis of Co‐Mo oxides by the evaporative decomposition of solutions method has been investigated. The oxides were prepared from atomized metal salt solution precursors decomposed in less than 3 s in air at 700°C. The materials obtained were primarily hollow spheres (1 to 6 μm) composed of fine (100 to 500 Å (10 to 50 nm)) crystallites. CoO, Co 2 Mo 3 O 8 , and CoMoO 4 were the major crystalline phases identified. The Co‐Mo oxides were depleted in Mo relative to the precursor solutions and could not be prepared with Co/Mo atom ratios less than unity. A schematic Co‐Mo‐O isothermal section was constructed to explain the compositions, morphologies, and phase distributions observed for materials having different Co/Mo ratios. The loss in Mo was explained by the high vapor pressure of MoO 3 .