Defect interaction and solid electrolyte transition in AgI-based materials

The first-order phase transition that leads to the superionic phase in AgI-based materials is studied by dc-conductivity measurements and a free energy model. By properly adjusting the model parameters, an abrupt change of disordering concentration, Δη̅, is predicted at a transition temperature, T t...

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Published inSolid state ionics Vol. 180; no. 36; pp. 1553 - 1557
Main Authors Burbano, J.C., Vargas, R.A., Peña Lara, D., Lozano Z., C.A., Correa, H.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 08.12.2009
Subjects
Free energy
Ionic conduction
Superionic conductors
Ionic conduction
Free energy
Superionic conductors
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Summary:The first-order phase transition that leads to the superionic phase in AgI-based materials is studied by dc-conductivity measurements and a free energy model. By properly adjusting the model parameters, an abrupt change of disordering concentration, Δη̅, is predicted at a transition temperature, T t . The temperature dependence of the dc-conductivity, σ( T), is well fitted to the η̅( T) equilibrium configuration obtained from the trial free energy function. The reported comparative study was done using an AgI–KI modified sample. The model also predicts a transition temperature, T c for a continuous phase transition (Δη̅ = 0).
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0167-2738
1872-7689
DOI:10.1016/j.ssi.2009.10.016