MSE101H1 Chapter Notes - Chapter 5: Indium Arsenide, Microstructure, Miller Index
3 Feb 2014
School
Department
Course
Professor
Document Summary
5. 1 calculate the fraction of atom sites that are vacant for copper at its melting temperature of 1084 c (1357 k). Assume an energy for vacancy formation of 0. 90 ev/atom. In order to compute the fraction of atom sites that are vacant in copper at 1357 k, we must employ equation. As stated in the problem, qv = 0. 90 ev/atom. Nvn= exp qvkt = exp 0. 90 ev/atom(8. 62 10 5 ev/atom-k)(1357 k) . 5. 2 calculate the energy for vacancy formation in silver, given that the equilibrium number of vacancies at 800 c (1073 k) is 3. 6 1023 m 3. The atomic weight and density (at 800 c) for silver are, respectively, 107. 9 g/mol and 9. 5 g/cm3. This problem calls for the computation of the activation energy for vacancy formation in silver. Upon examination of equation 5. 1, all parameters besides qv are given except n, the total number of atomic sites.
