Intimate Frenkel Pairs
It has recently been postulated that Wigner energy can be stored by the formation of metastable defect structures in graphite. Notably the large energy release observed at 200-250°C has been described in terms of a metastable interstitial-vacancy pair (Ewels et al., PRL2003). The interstitial atom becomes trapped on the lip of the vacancy, and there is a barrier for it to recombine to give perfect graphite.
Read more about this topic: Wigner Effect
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