Foundations of Materials Science and Engineering
Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Chapter 5.7, Problem 28AAP
To determine

The diffusivity D of the carbon into HCP titanium.

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Thermal Diffusivity Estimate the thermal diffusivity of butter at 20°C.
What are the best characteristics of each nano-material (nano-titanium dioxide, silver nano particles, and graphene)? In which application are they most suitable?
Consider a 2-mm-thick silicon (Si) wafer to be doped using antimony (Sb). Assume that the dopant source (gas mixture of antimony chloride and other gases) provides a constant concentration of 1022 atoms/m3. We need a dopant profile such that the concentration of Sb at a depth of 1 micrometer is 5 x 1021 atoms/m3. What is the required time for the diffusion heat treatment? Assume that the silicon wafer initially contains no impurities or dopants. Assume that the activation energy for diffusion of Sb in silicon is 380 kJ/mole and D0 for Sb diffusion in Si is 1.3 x 10-3 m2/s. Assume T = 1250°C.

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