homework6 - Matsc 503 Kinetics of Materials Processes...

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Matsc 503 Kinetics of Materials Processes Spring 2002 Problem Set #6 Due April 3 1. To study the diffusion of nickel in the grain boundaries of nickel oxide NiO in the temperature range between 500 o C and 800 o C, polycrystalline nickel oxide samples were prepared by oxidation of pure nickel foils. The material thus obtained had equiaxed grains with an average diameter of about 10 µ m. A thin layer of tracer ( 63 Ni) was deposited on the surface. After diffusion annealing, the penetration profile was determined by a sectioning technique based on RF sputtering. The anneals were carried out at 4 different temperatures (500, 600, 700, 800 o C) under a pressure of one atmosphere of pure oxygen. The data are given in table below T o C t (s) D (cm 2 /s) D δ (cm 3 /s) 800 6.6x10 2 2.1x10 -14 1.4x10 -16 700 7.2x10 3 1.2x10 -15 600 6.05x10 5 3.7x10 -17 1.8x10 -18 500 8.6x10 5 4.5x10 -19 5.6x10 -20 D and D ' are the diffusion coefficients of nickel in the volume and the grain boundaries, respectively. δ
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This note was uploaded on 01/19/2010 for the course MAT SCI 503 taught by Professor Chen during the Spring '02 term at Pennsylvania State University, University Park.

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homework6 - Matsc 503 Kinetics of Materials Processes...

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