Glass coating of YBa2Cu3Oxwires

Wu, Wenbin; Chui, Chanthoeun; Routbort, J.L.; Hodge, J. D.; Klemptner, L. J.; Applegate, D.S.; Goretta, K. C.

doi:10.1088/0953-2048/7/9/012

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2003

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“…12,18,19 Although Y-123 is greatly degraded by water and humid air, 9,20 this effect should not preclude its practical application since it is possible to protect Y-123 by coating of silver or glass. [21][22][23][24][25] Although most of the literature reports are focusing on the reaction of high-T c superconductors with water or vapor qualitatively, 11,16,17 we have investigated the reaction of Bi-2223 with water kinetically. 14,15 It is found that the rate law is first order dependent on the surface area of the powder sample, and the reaction rate is greatly reduced at high pH.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Study on the Reaction of YBa₂Cu₃O_y Powder with Water

Lin

Wang

et al. 2003

Int. J. Mod. Phys. B

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The reaction of superconducting YBa 2 Cu 3 Oy powder with water is studied kinetically. The initial rate law is found aso 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, Ro 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 × 10 6 mol · min −1 · cm −2 · M −0.3 , as calculated from the Arrhenius equation.

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