Equilibrium Concentration Study Sheet | Lecture Note - Edubirdie

University:
York University
Course:
CHEM 1100 | Chemistry and Materials Science for Engineers
Academic year:

2021
Views:

385

Pages:

1
Author:

Nick T.

Equilibrium Concentration Varies with Temperature Nv: Number of defects N: Total number of potential defect sites (number of atoms in the lattice) Qv: Activation energy per vacancy k: Boltzmann constant (1.38 x 10^-23 J/atom K) T: Temperature in Kelvin Equation: Nv = N * e^(-Qv / kT) Example: Given: ρ = 8.4 g/cm³ Ac = 63.5 g/mol N_A = 6.02 x 10^23 atoms/mol Qv = 0.9 eV/atom T = 1000°C = 1273 K Calculation: N = (ρ * N_A) / Ac = 8.0 x 10^28 sites/cm³ Nv = N * e^(-Qv / kT) = 2.2 x 10^25 vacancies/cm³

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