At 700 C, an YBa 2 Cu 3 O 7 sphere of 2 cm radius is abruptly
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At 700 °C, an YBa2Cu3O7−δ sphere of 2 cm radius is abruptly exposed to 1 bar O2 gas. Assuming DO = 10−5 cm2/s and diffusion as the rate-controlling process, calculate how long it will take before 90% of the total oxidation change occurs 1 mm below the surface. Under these conditions, the sphere center will oxidize by less than 1%, so that the sphere can be approximated as an infinite half-space.
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The 90 change refers to the relative cr variable Figure ...View the full answer
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Related Book For
Solid State Materials Chemistry
ISBN: 9780521873253
1st Edition
Authors: Patrick M. Woodward, Pavel Karen, John S. O. Evans, Thomas Vogt
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