Superionic behavior in the xAgI–(1−x)CsAg2I3 polycrystalline system

descriptionPublicationkeyboard_double_arrow_right Article 01 Jun 2016 English Publisher:Elsevier BVJournal:Journal of Physics and Chemistry of Solids, volume 93, pages 126-130 (issn: 0022-3697,

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Authors: Rodríguez, L. A.; Zapata, James; Vargas, R. A.; Peña, Diego; Diosa, J. E.;

doi: 10.1016/j.jpcs.2016.02.018

handle: 10261/159931

Superionic behavior in the xAgI–(1−x)CsAg2I3 polycrystalline system

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Abstract

A superionic phase behavior (with DC ionic conductivities higher than 0.01 S/cm) has been observed in xAgI-(1-x)CsAgI (x≈0.67) polycrystalline system grown by slow evaporation using AgI and CsI powders (molar ratio Cs/Ag=0.25) as starting salts and an aqueous solution of HI as solvent. The transition from the normal-to- the superionic state is first-order with a hysteretic behavior in temperature centered at about 116 °C as reflected by thermal (DSC) and electrical conductivity measurements. This mixture is composed of CsAgI and AgI crystalline phases and an additional amorphous AgI phase that explains the glassy-type behavior observed in the superionic phase transition.

The authors are grateful for the financial support from the Colombian Research Agency, COLCIENCIAS and the Center of Excellence in New Materials (CENM), Universidad del Valle, Cali, Colombia.

Peer Reviewed

Related Organizations

Spanish National Research Council
Spain
University of Valle
Colombia
Centre national de la recherche scientifique
France
University of Zaragoza
Spain
French National Centre for Scientific Research
France

Keywords

Ionic conductivity, Phase transitions, Crystal structures, Differential scanning calorimetry (DSC), X-ray diffraction

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