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Binary kinetics in the Y‐Ba‐Cu system: 1. Mixed powders
Author(s) -
Sobolik Jeffrey L.,
Thomson William J.
Publication year - 1995
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690410713
Subject(s) - kinetics , nucleation , limiting , diffusion , particle (ecology) , thermodynamics , chemistry , particle size , chemical kinetics , materials science , chemical engineering , mineralogy , physics , mechanical engineering , oceanography , quantum mechanics , engineering , geology
The kinetics of the reactions between mixed powders BaCO 3 and CuO, as well as BaCO 3 and Y 2 O 3 , have been studied using DXRD techniques as a function of particle size, temperature, and CO 2 pressure. Except for intial nucleation phenomena, the reaction ration rates are governed by shrinking core bahavior for BaCO 3 particle sizes between 6 and 33 μm. During the initial stages of the reactions, the surface reaction kinetics are gare governing, whereas the diffusion of CuO, Y 2 O 3 , and CO 2 are limiting factors at later stages in the reactions. Quantitative conversion dat were used to determine the values of the activation energies and the pertinent diffucivities in these systems.