Kinetic Study on the Reaction of YBa2Cu3Oy Powder with Water

Author:

Yu F. C.1,Lin C. H.1,Wang C. M.1,Kao H.-C. I.1

Affiliation:

1. Department of Chemistry, Tamkang University, Tamsui, Taiwan 251, R.O.C

Abstract

The reaction of superconducting YBa 2 Cu 3 O y powder with water is studied kinetically. The initial rate law is found as [Formula: see text] where [S] o is the initial surface area of the solid, a and b is found to be 0.94 ± 0.02 and 0.318 ± 0.002, respectively. For 100.7 mg powder with a mean radius of 0.0265 mm at pH 7.00 and 298 K, R o is 2.21 × 10-4 mol · min -1. Using a = 1 and b = 0.3, the rate constant, k, obtained at 283, 298 and 313 K is 0.64, 1.84 and 4.91 × 10-3 mol · min -1 · cm -2 · M -0.3, respectively. The activation energy is 50.0 kJ · mol -1 and pre-exponential factor is 1.09 × 106 mol · min -1 · cm -2· M -0.3, as calculated from the Arrhenius equation.

Publisher

World Scientific Pub Co Pte Lt

Subject

Condensed Matter Physics,Statistical and Nonlinear Physics

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