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Kinetic study and modeling of the solid-state reaction Y2BaCuO5 + 3BaCuO2 + 2CuO ⇉ 2YBa2Cu3O6.5−x + xO2

Published online by Cambridge University Press:  31 January 2011

Nae-Lih Wu ,
Ta-Chin Wei ,
Shau-Y Hou  and
S-Yen Wong
Nae-Lih Wu*
Affiliation:
Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, Republic of China.
Ta-Chin Wei
Affiliation:
Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, Republic of China.
Shau-Y Hou
Affiliation:
Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, Republic of China.
S-Yen Wong
Affiliation:
Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, Republic of China.
*
a)Address correspondence to this author.
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Abstract

The kinetics of the solid-state reaction Y2BaCuO5 + 3BaCuO2 + 2CuO ⇉ 2YBa2Cu3O6.5−x + xO2 was studied by using x-ray diffractometric and thermogravimetric analyses. Both analyses established that the reaction was well described by the kinetic equation: 1 − 3(1 − F)2/3 + 2(1 − F) = k0 exp(− E/RT)t, where F is the fractional conversion of a calcined powder, E is 520 kcal/molc and, for a rcactant mixture with an average particle size of 3 μm, k0 is 2.03 ⊠ 1092 min−1. An unreacted-core shrinking model was proposed to obtain the particle-size dependence of the reaction, and predicted that the pre-exponential constant k0 changed with reactant particle size by k0 = 2.03 ⊠ 1092(3/d)2 exp(4/d − 4/3), where d is the average reactant particle size in μm.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 10 , October 1990 , pp. 2056 - 2065
Copyright
Copyright © Materials Research Society 1990

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References

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