Abstract
The unpaired elastic force model (EFM) developed by Kushwaha and Kushwaha 1) has been extended to study the lattice dynamics of solid Neon (Ne) and Xenon (Xe). The application of the model has been made to calculate the phonon frequencies of Ne and Xe at all the irreducible points of the first Brillouin Zone. Use thereof has been made to calculate the lattice heat capacities and Debye characteristic temperatures in the temperature range 4–24 K and 4–100 K for Ne and Xe respectively. The calculated values of phonon frequencies along the three symmetry directions [100], [110], and [111], heat capacities and the Debye characteristic temperatures have been compared with the recent available experimental data. The merits and demerits of the model have been widely discussed.
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