Resumo

VARGAS, Rubén A.. DINÁMICA DEL PROTÓN EN MATERIA CONDENSADA: POLÍMEROS Y CRISTALES IÓNICOS. Rev. acad. colomb. cienc. exact. fis. nat. [online]. 2013, vol.37, n.142, pp.75-88. ISSN 0370-3908.

Using impedance spectroscopy measurements in the radio-frequency range in two types of proton conducting materials with disordered structure, ionic crystals with disordered hydrogen bonds (MH₂PO₄, M = NH₄, K) and solid polymers based on poly (vinyl alcohol) (PVOH), the proton dynamics have been investigated. They display similar characteristics of their complex conductivity, permittivity and electric modulus spectra. Both materials show an Arrhenius-type thermally activated dc conductivity; their conductivities are described at high frequencies (w/2p) by a power-law dependency wⁿ, where 0<n≤1 (Jonscher's law) and the electric modulus spectra follows in the time domain an exponential decay function , where t is temperature activated and relaxation time, and 0<b<1 describes the slowing down of the relaxation process as a result of proton hopping.

Palavras-chave : polymers; ionic crystals; proton dynamics; electrical relaxation; universal behavior.

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