Kinetics and mechanism of solid-state reaction between bismuth(III) oxide and molybdenum(VI) oxide

Journal Article · Wed Mar 31 23:00:00 EST 1982 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(82)90260-2· OSTI ID:6596500

Rastogi, R P; Singh, A K; Shukla, C S

The mechanism of the following solid-state reactions between bismuth(III) oxide and molybdenum(VI) oxide was investigated within the temperature range 400-650/sup 0/C. Two types of experiments, capillary and particle size, were performed to ascertain whether MoO/sub 3/ diffuses into Bi/sub 2/O/sub 3/ or vice versa. These show that molybdenum trioxide diffuses into bismuth oxide grains. If ..cap alpha.. is the fraction of molybdenum trioxide reacted, the kinetics in all five cases are found to be governed by the equation ..cap alpha../sup n/ = 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. Results are also fitted by the relation ..cap alpha.. = k/sub 2/t/sup 1///sup 2/ - k/sub 3/t, where k/sub 2/ and k/sub 3/ are constants, which show that the reactions occur by bulk diffusion through grain boundary contacts. The number of grain boundary contact points decreases with time in the course of reaction.

• Research Organization: Gorakhpur Univ., India
• OSTI ID: 6596500
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 42:2; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
BISMUTH COMPOUNDS
BISMUTH OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
COHERENT SCATTERING
COMPARATIVE EVALUATIONS
DATA
DIFFERENTIAL THERMAL ANALYSIS
DIFFRACTION
DIFFUSION
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
INFORMATION
KINETICS
MEDIUM TEMPERATURE
MELTING POINTS
MICROSCOPY
MOLYBDATES
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PHYSICAL PROPERTIES
REACTION KINETICS
SCANNING ELECTRON MICROSCOPY
SCATTERING
SIZE
TEMPERATURE DEPENDENCE
THERMAL ANALYSIS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION