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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