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I wondered about the exact definition of a bipolaron? In particular, if I have an oxygen vacancy in a metal oxide and the 2 excess electrons (when forming a neutral oxygen vacancy) localise on the 2 surrounding metal atoms, is this a bipolaron? And does the term "dipolaron", for having two electrons (holes) localised at the same (metal) centre, exist?

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  • $\begingroup$ Cross-posted physics.stackexchange.com/questions/478328/… $\endgroup$ – Mithoron May 8 '19 at 22:06
  • $\begingroup$ I am afraid that often when physics and chemistry nomenclature and dictionaries met confusion arise. P and BP are encountered in conjugated systems, where they stand for radical-ions and divalent ions, respectively. I would say that bipolaron should refer to bound, rather localized states, at least formally without assuming the real existence of them. $\endgroup$ – Alchimista May 9 '19 at 8:11
  • $\begingroup$ Thanks for your answer! What is yet not clear to me though is if the 2 localised charges in a bipolaron are localised on the same centre or at 2 centres in close proximity (from the examples I saw in textbooks, it seems like the latter one). $\endgroup$ – Fraenzine May 10 '19 at 10:01

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