Peierls energy

Peierls Force Continuous vs. Discontinuous Motion. In some crystals (e.g., covalent crystals) the Peierls force may be so large that the driving force due to the applied stress will not be able to drive the dislocation forward. In such a case the dislocation will be rendered immobile. However, at elevated temperatures, the dislocation may be able to surmount the Peierls energy barrier by means of stress-aided thermal activation, as in Fig. 11.5. 

Figure 11.5 Movement of dislocation across a Peierls energy barrier by thermally...

Finally, lateral movement of the wall is resisted by pinning as described by the Peierls energy ... 

Fig. 9.11 The temperature dependence of the real Peierls energy gap A(7) and the energy gap A p(T) obtained from the BCS theory (see text).

Figure 10.10. Dislocation motion in the Peierls energy landscape, through formation of kink-antikink pairs.

Fig. 29. Screw dislocation gliding along two different directions (see text), as a function of an applied strain. Maximum energies along the MEP are the Peierls energies they are reported in the inset graph...

The optical absorbance of pernigraniline base. Fig. 8, though similar to that of EB is different in origin. In particular, the 2.3 eV absorption in PNB has been assigned to the excitation across a Peierls energy gap. This Peierls gap has been proposed to arise from two independent contributions, variation in bond length order parameter and variation in ring torsion... 

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