KINETICS AND MECHANISM OF SOLID-STATE REACTION BETWEEN BISMUTH (III) OXIDE AND MOLYBDENUM (VI) OXIDE.

Article abstract of DOI:10.1016/0022-4596(82)90260-2

The mechanism of the following solid-state reactions between bismuth III oxide and molybdenum (VI) oxide was investigated within the temperature range 400-650 degree C. Two types of experiments, capillary and particle size, were performed to ascertain whether MoO//3 diffuses into Bi//2O//3 or vice versa. These show that molybdenum trioxide diffuses into bismuth oxide grains. If alpha is a fraction of molybdenum trioxide reacted, the kinetics in all five cases are found to be governed by the equation alpha **n equals kt throughout the temperature range, where n and k are constants at a given temperature and t is the time. Both n and k are temperature dependent. The characteristic feature of these reactions is that they proceed to completion.