Kinetic study of the oxidation of zeta phase praseodymium oxide: 10/9 Pr/sub 9/O/sub 16/ + 1/9 O/sub 2/. -->. Pr/sub 10/O/sub 18/
Journal Article
·
· J. Solid State Chem.; (United States)
Kinetic and thermodynamic studies of the oxidation of zeta (n = 9 in Pr/sub n/ O/sub 2n-2/) to epsilon (n = 10) phase have been carried out using a thermogravimetric technique. The experiments covered a temperature range of 464 to 503/sup 0/C and oxygen pressure varied from 0.01 to 50 Torr. The existence of a reproducible hysteresis loop which depends on the temperature and pressure is shown. Measurements of the oxidation rate under isothermal conditions were fitted to different rate equations and have been found to be well represented by the equation f = 1 - (1 - kt)/sup 3/. This fact indicated that the process of oxidation was predominantly controlled by the chemical reaction at the interface. The activation energy for the reaction has been calculated to be 15.9 kcal/mole.
- Research Organization:
- Arizona State Univ., Tempe
- OSTI ID:
- 5935548
- Journal Information:
- J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 40:2; ISSN JSSCB
- Country of Publication:
- United States
- Language:
- English
Similar Records
Kinetic study of the oxidation and reduction of praseodymium oxides: (1/7) Pr/sub 7/O/sub 12/ + (1/7 - x/2) 0/sub 2/ reversible PrO/sub 2-x/
Isotopic exchange of $sup 18$O with the oxygen of niobium(V) oxide
Kinetics of oxidation of phi-phase terbium oxide: 7/2Tb/sub 2/O/sub 3+delta/ + (3/4 - 7/4 delta)O/sub 2/. -->. Tb/sub 7/O/sub 12/
Journal Article
·
Sat Mar 14 23:00:00 EST 1981
· J. Solid State Chem.; (United States)
·
OSTI ID:6469492
Isotopic exchange of $sup 18$O with the oxygen of niobium(V) oxide
Journal Article
·
Sun Dec 31 23:00:00 EST 1972
· Z. Phys. Chem. (Frankfurt), v. 86, no. 1/2, pp. 50-58
·
OSTI ID:4389968
Kinetics of oxidation of phi-phase terbium oxide: 7/2Tb/sub 2/O/sub 3+delta/ + (3/4 - 7/4 delta)O/sub 2/. -->. Tb/sub 7/O/sub 12/
Journal Article
·
Sat Nov 14 23:00:00 EST 1981
· J. Solid State Chem.; (United States)
·
OSTI ID:5769866
Related Subjects
36 MATERIALS SCIENCE
360205 -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DATA
ENERGY
EXPERIMENTAL DATA
GRAVIMETRIC ANALYSIS
HIGH TEMPERATURE
HYSTERESIS
INFORMATION
KINETICS
LOW TEMPERATURE
MEDIUM VACUUM
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
PRESSURE DEPENDENCE
QUANTITATIVE CHEMICAL ANALYSIS
RARE EARTH COMPOUNDS
REACTION KINETICS
TEMPERATURE EFFECTS
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THERMODYNAMICS
360205 -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DATA
ENERGY
EXPERIMENTAL DATA
GRAVIMETRIC ANALYSIS
HIGH TEMPERATURE
HYSTERESIS
INFORMATION
KINETICS
LOW TEMPERATURE
MEDIUM VACUUM
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
PRESSURE DEPENDENCE
QUANTITATIVE CHEMICAL ANALYSIS
RARE EARTH COMPOUNDS
REACTION KINETICS
TEMPERATURE EFFECTS
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THERMODYNAMICS