NDLI: γ-Li4 – 3xAlxGeO4 solid electrolytes: phase equilibria, conductivity and glass-transition-like behaviour

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γ-Li_{4 – 3x}Al_xGeO₄ solid electrolytes: phase equilibria, conductivity and glass-transition-like behaviour

Content Provider	Royal Society of Chemistry (RSC)
Author	West, Anthony R. Lee, Chnoong Kheng
Copyright Year	1993
Abstract	The phase diagram Li4GeO4–LiAlGeO4 has been shown to contain a short range of Li4GeO4 solid solutions, a range of γ solid solutions, Li4 – 3xAlxGeO4[where (0.04–0.13)<x<0.30] and a line phase, α, with x= 0.375. The γ solid solutions are stable up to melting at 1140–1160°C and the α phase is stable between 1080 and 1160°C only. X-Ray powder data are given for α and γ solid solutions.The γ solid solutions exhibit a remarkable temperature-independent conductivity of Li+ ions above ca. 700 °C which is particularly noticeable at low values of x. With decreasing temperature, Li+ ion motion is increasingly thermally activated, with an activation energy of 0.45–0.60 eV at temperatures below 300°C. The highest room-temperature conductivity was ca. 2 × 10–5Ω–1 cm–1 in freshly quenched γ samples of x= 0.10, but the conductivity gradually decreased with time owing to ageing. There is evidence from differential scanning calorimetry (DSC) studies of a sluggish order–disorder transition at 200–250°C involving the Li+ ion site occupancies, which has many of the characteristics of a glass transition. An additional second-order transition occurs at 480–500°C which is attributed to a change from disordered to liquid-like properties of the mobile Li+ ions.
Starting Page	191
Ending Page	196
Page Count	6
File Format	PDF
ISSN	09599428
Volume Number	3
Issue Number	2
Journal	Journal of Materials Chemistry
DOI	10.1039/JM9930300191
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	DSC Li Phase diagram Ion Activation energy Electronvolt Differential scanning calorimetry Glass transition
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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