Question

Compute the concentration (count per volume) of vacancies in gold at 700oC if the lattice parameter of FCC gold is 4.12 Å at 700oC.

The activation energy to form a single vacancy is 0.86 eV. Use 8.617x10-5 eV/(atom-K), exactly, as Boltzmann's Constant.

Note: You could look up the atomic weight of gold and its density (being sure to account for thermal expansion, since most values are reported for room temperature).

But, like a previous question, using the atom count per unit cell (FCC in this case) and the volume of the unit cell to compute the atom site concentration (atom site /

volume) is easier in this case.

Be sure to use values exactly as given and do not round until the final answer.

Answer Format: X.XXeX where eX stands for *10x

Units: vacancies/cm3

Example: For an answer of 158123.126 you would type: 1.6e5

Answer 1

DATE: onc m er unit vwlume ke eeltzman n Constant Here Luこ0.36 eV 0,8b 8.611x913) ラ !