Comment on "Green's-function calculation of the lattice response near the vacancy in Si"
- 15 June 1986
- journal article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 33 (12) , 8785-8788
- https://doi.org/10.1103/physrevb.33.8785
Abstract
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 . 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 . It could be negative.
Keywords
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