Determination of the Si-Si bond energy from the temperature dependence of elastic modulus and surface tension

We report a theoretical method to obtain the single-bond energy derivative from temperature-dependent Young's modulus and surface tension based on the extension of the recently developed bond-order-length-strength correlation mechanism to the temperature domain. Reproducing simultaneously the measured physical quantities of the Si specimen could reveal the information on the Si-Si single-bond energy. It is shown that the single-bond energy and the response of the stimulus of temperature change can be connected to the bulk properties. Analytical solutions also provide a consistent understanding of the interdependence of these quantities and their commonly atomistic origin as arising from thermally driven bond expansion and bond weakening, which is beyond the scope of conventional approaches.