The diffusion of yttrium ions along grain boundaries in chromium oxide (Cr2CO3) has been studied by Lesage
Question:
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(a) From these data, show that the activation energy for grain-boundary diffusion of yttrium in Cr2CO3 is 190 kJ/cal.
(b) What is the value of the pre-exponential term D0 in cm2/s?
(c) What is the relationship between D and 1/T for the grain-boundary diffusivity in this temperature range?
(d) At any given temperature, the diffusivity of chromium along grain boundaries is several orders of magnitude higher than that within the bulk. Is this to be expected? Explain.
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The data for ln D vs 1T are shown below The slope of a stra...View the full answer
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Related Book For 
Essentials of Materials Science and Engineering
ISBN: 978-1111576851
3rd edition
Authors: Donald R. Askeland, Wendelin J. Wright
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