A. Ney, R. Rajaram, et al.
Journal of Magnetism and Magnetic Materials
A fallacious claim is made by Lannoo and Allan [Phys. Rev. B 25, 4089 (1982)] that a soft phonon mode, which might result from a vacancy in Si, could produce a large entropy of formation for the vacancy in Si (>15kB). The fallacy results from the use of a formula that is valid only in the harmonic approximation and cannot be applied to the case of a soft mode. The actual value of the entropy associated with a soft mode, if there were one, would not exceed 3.4kB. It could be negative. © 1986 The American Physical Society.
A. Ney, R. Rajaram, et al.
Journal of Magnetism and Magnetic Materials
Mark W. Dowley
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R.M. Macfarlane, R.L. Cone
Physical Review B - CMMP
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EMC 2011