EX defects.ppt

# EX defects.ppt

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EX 1 : Calculate the composition, in weight percent, of an alloy that contains 105 Kg Fe, 0,2 Kg C, 1Kg Cr. EX 2: What is the composition, in atom percent, of an alloy that contains 33 g Cu and 47 g Zn ? A Cu = 63.55g/mol A Zn = 65.39 g/mol

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EX 3: Calculate the number of atoms per cubic meter in lead ? density = 11.35 g/cm 3 , atomic weight = 207.2 g/mol. EX 4: Calculate the fraction of atom sites that are vacant at 1000 K for formation energies of a) 1 eV/atom, b) 3 eV/atom. Conclude. (1.38 x 10 -23 J/atom-K) (8.62 x 10 -5 eV/atom-K) Boltzmann's constant EX 5: Calculate the fraction of atom sites that are vacant for copper at 1357 K. The energy for vacancy formation is : 0.90 eV/atom. EX 6: Calculate the number of vacancies per cubic meter in gold at 1173 K. The energy for vacancy formation is 0.98 eV/atom. The density and atomic weight for Gold are 18.63 g/cm3 and 196.9 g/mol, respectively.
EX 7 : Calculate the activation energy for vacancy formation in silver, given that the equilibrium number of vacancies at 800°C (1073 K) is 3.6 x 10

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