Exercise 2.1-3

Calculate Formation Entropies

Calculate the formation entropy for a simple cubic crystal.
Assume that there are two kinds of springs holding the atoms together: Springs between next neighbors, and springs between second next neighbors.
Look at the resonance frequency as a function of the spring constant D (make some assumptions about the spring constant D2 of the second-next-neighbor spring in terms of the spring constant D1 of the next neighbors).
Calculate the formation entropy first by only considering the D1 springs; than consider the D2 springs, too.

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