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Glass Formation and Ionic Conduction Behavior in GeSe 2 –Ga 2 Se 3 –NaI Chalcogenide System
Author(s) -
Zhai Sumin,
Li Legang,
Chen Feifei,
Jiao Qing,
Rüssel Christian,
Lin Changgui
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13815
Subject(s) - ionic conductivity , materials science , ionic bonding , ion , fast ion conductor , activation energy , chalcogenide , analytical chemistry (journal) , crystallite , thermal conduction , raman spectroscopy , chalcogenide glass , mineralogy , electrolyte , chemistry , electrode , optics , composite material , metallurgy , physics , organic chemistry , chromatography
Series of glassy and glass‐ceramic samples in the GeSe 2 –Ga 2 Se 3 –NaI system is prepared by melt‐quenching technique and the glass‐forming region is well‐defined by XRD investigations. Na‐ion conduction behavior is systemically studied by impedance measurements. For the glasses in the series (100−2 x )GeSe 2 – x Ga 2 Se 3 – x NaI, ionic conductivities increased with increasing x , whereas the attributed activation energy of ion conduction decreases. The enhanced mechanism is discussed by employing Raman spectra. In addition, the effect of the crystal phases NaI and Ga 2 Se 3 on the ionic conduction behavior in the (70− x )GeSe 2 – x Ga 2 Se 3 –30NaI samples is discussed. Although it shows that the poorly conducting crystallites of NaI and Ga 2 Se 3 have a negative effect on the ionic conductivities in this series, the highest ionic conductivity of 1.65 × 10 −6 S/cm is obtained in the 45GeSe 2 –25Ga 2 Se 3 –30NaI glass. Finally, this study also demonstrates a possible way to search appropriate Na‐ion solid electrolytes for all‐solid‐state batteries.