Abstract
A study of the magnetic susceptibility of the emeraldine form of polyaniline shows the presence of a Pauli susceptibility approximately linearly proportional to the degree of protonation in agreement with phase segregation into metallic and nonmetallic phases. A model based upon the transition upon protonation from isolated doubly charged protonated diimine groups to a polaronic metal is suggested, together with the role of localization of polarons at the surface of and within the disordered small metal particles formed.
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