Open AccessResearch on the conductivity of KAg4 I5-AgI composite
Author(s) -
Shaohua Gao,
Yuxia Wang,
Hongwei Wang,
Shuai Yuan
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.086601
Subject(s) - materials science , differential scanning calorimetry , ionic conductivity , composite number , conductivity , dielectric spectroscopy , phase transition , phase (matter) , ionic bonding , scanning electron microscope , hysteresis , analytical chemistry (journal) , diffraction , ion , thermodynamics , composite material , condensed matter physics , optics , chemistry , physics , organic chemistry , electrode , electrochemistry , chromatography , electrolyte
KAg4I5(10%AgI) composite is prepared by the solid-state reaction method in the dark and dry conditions, and its structure, morphology, ion conductivity properties, and phase transition temperature are studied by X-ray diffraction, scanning electron microscope, impedance spectroscopy, differential scanning calorimetry and other analytical tools. The results show that when the two phases (AgI and KAg4I5 phases) in the composite are both fast ionic conductor phases, ionic conductivity of composite is higher than that of the single phase, and the heating and cooling of the conductivity curves form a hysteresis loop.During heating and cooling, AgI phase transition temperature lags 5 and 10 ℃ respectively.We use the interaction interface, the interface stress phase and Gouy-Chapman model to analyze the mechanism for the improved conductivity of this composite and phase transition temperature change when the two phases are both the fast ionic conductive.