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Unformatted text preview: increases with increasing temperature, D (900) > D (700). Concept Check 5.2 Question: Consider the self-diffusion of two hypothetical metals A and B. On a schematic graph of ln D versus 1/T, plot (and label) lines for both metals given that D (A) > D (B) and also that Q d (A) > Q d (B). Answer: The schematic ln D versus 1/ T plot with lines for metals A and B is shown below. As explained in the previous section, the intercept with the vertical axis is equal to ln D . As shown in this plot, the intercept for metal A is greater than for metal B inasmuch as D (A) > D (B) [alternatively ln D (A) > ln D (B)]. In addition, the slope of the line is equal to – Q d /R . The two lines in the plot have been constructed such that negative slope for metal A is greater than for metal B, inasmuch as Q d (A) > Q d (B)...
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- Fall '07
- Strontium, atively ln D0, substitutional impurity diffusion