材料科学
烧结
微观结构
威布尔模量
电解质
离子电导率
粒度
相对密度
流延
复合材料
电导率
弹性模量
晶粒生长
抗弯强度
电极
物理化学
化学
作者
Enkhtsetseg Dashjav,Michael Gellert,Gang Yan,Daniel Grüner,Nico Kaiser,Stefan Spannenberger,Irina Kraleva,Raúl Bermejo,Marie Theres Gerhards,Qianli Ma,Jürgen Malzbender,Bernhard Roling,Frank Tietz,Olivier Guillon
标识
DOI:10.1016/j.jeurceramsoc.2020.01.017
摘要
Free-standing Li1.5Al0.5Ti1.5P3O12 electrolyte sheets with a thickness of 50–150 μm were prepared by tape casting followed by sintering at 850–1000 °C in air. While a sintering temperature of 850 °C was too low to achieve appreciable densification and grain growth, a peak relative density of 95% was obtained at 920 °C. At higher sintering temperatures, the microstructure changed from a bimodal grain size distribution towards exclusively large grains (> 10 μm), accompanied by a decrease in relative density (down to 86% at 1000 °C). In contrast, ionic conductivity increased with increasing sintering temperature, from 0.1 mS/cm at 920 °C to 0.3 mS/cm at 1000 °C. Sintering behavior was improved by adding 1.5% of amorphous silica to the slurry. In this way, almost full densification (99.8%) and an ionic conductivity of 0.2 mS/cm was achieved at 920 °C. Mechanical characterization was carried out on the almost fully densified material, yielding elastic modulus and hardness values of 109 and 8.7 GPa, respectively. The fracture strength and Weibull modulus were also characterized. The results confirm that densification and reduction of grain size improve the mechanical properties.
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