Calculation on some defect parameters in lead

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Abstract
The lattice statics method has been used for relaxation calculations in lead due to a vacancy created in the lattice. Using the measured phonon dispersion relations and the elastic constants as constraints the dynamical matrix is derived considering progressively the interactions up to seventh neighbour. The calculation shows that the first twelve neighbours relax towards the vacancy whereas the second six relax outwards. In general, the displacements are found to be larger in the close-packed directions. The divacancy binding energy is found to be in accordance with other calculations and the bond model. The formation energy of the monovacancy is also found to be very close to the experimental value.