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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/5301

Title: Charge carrier mobility and concentration as a function of composition in AgPO3-AgI glasses
Other Titles: Journal of Chemical Physics
Authors: Rodrigues, Ana Candida Martins
Nascimento, Marcio Luis Ferreira
Bragatto, Caio Barca
Souquet, Jean Louis
Issue Date: 2-Jan-2011
Abstract: Conductivity data of the xAgI(1 − x)AgPO3 system (0 ≤ x ≤ 0.5) were collected in the liquid and glassy states. The difference in the dependence of ionic conductivity on temperature below and above their glass transition temperatures (Tg) is interpreted by a discontinuity in the charge carrier’s mobility mechanisms. Charge carrier displacement occurs through an activated mechanism below Tg and through a Vogel-Fulcher-Tammann-Hesse mechanism above this temperature. Fitting conductivity data with the proposed model allows one to determine separately the enthalpies of charge carrier formation and migration. For the five investigated compositions, the enthalpy of charge carrier formation is found to decrease, with x, from 0.86 to 0.2 eV, while the migration enthalpy remains constant at ≈0.14 eV. Based on these values, the charge carrier mobility and concentration in the glassy state can then be calculated. Mobility values at room temperature (≈10−4 cm2 V−1 s−1) do not vary significantly with the AgI content and are in good agreement with those previously measured by the Hall-effect technique. The observed increase in ionic conductivity with x would thus only be due to an increase in the effective charge carrier concentration. Considering AgI as a weak electrolyte, the change in the effective charge carrier concentration is justified and is correlated to the partial free energy of silver iodide forming a regular solution with AgPO3.
Description: 8 p.
URI: http://www.repositorio.ufba.br/ri/handle/ri/5301
ISSN: 1089-7690
Appears in Collections:Artigos Publicados em Periódicos (PEI)

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