Effects of burial powder configuration on the microstructure, composition, and ion conductivity of perovskite Li 3 x La 1/3‐ x TaO 3 ion conductors
Effects of burial powder configuration on the microstructure, composition, and ion conductivity of perovskite Li 3 x La 1/3‐ x TaO 3 ion conductors
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埋藏粉配置对钙钛矿Li 3 x La 1/3×TaO 3 离子导体微观结构、成分和离子电导率的影响
DOI：
10.1111/jace.18730
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发表时间：
2023
影响因子：
3.9
通讯作者：
Ihlefeld, Jon F.
中科院分区：
文献类型：
--
作者：
Brummel, Ian A.;Wynne, Kevin;Lanford, William A.;Ihlefeld, Jon F.
提出了一种制备 x= 0.033 的钙钛矿 Li3xLa1/3-xTaO3 锂离子导体的燃烧合成方法。块状陶瓷样品在埋埋粉末和盖坩埚的组合下进行烧结，以提供不同的锂蒸气超压条件。发现在室温下，用母体粉末密封其唇部的坩埚覆盖的颗粒在室温下的最大总锂离子电导率为 6 × 10-6S cm-1，与晶间离子电导率的最大值一致。粒内电导率在低过压条件下达到最大。通过核反应分析和能量色散 X 射线光谱相组成测量的组合，发现离子电导率的趋势与样品中的锂含量相对应。影响离子电导率的机制被确定为 LaTaO4 第二相量的变化，这是由烧结过程中的加工条件驱动的。
A combustion synthesis methodology for the preparation of perovskite Li3xLa1/3‐xTaO3lithium‐ion conductors withx= 0.033 is presented. Bulk ceramic specimens were sintered under combinations of burial powder and cover crucibles to provide different lithium vapor overpressure conditions. A maximum total lithium ion conductivity of 6 × 10‐6S cm‐1at room temperature was found for the pellet covered by a crucible whose lip was sealed using parent powder (moderate overpressure), with agreement to the maximum in the intergranular ion conductivity. Intragranular conductivity was maximized at the low overpressure condition. The trend in ion conductivity was found to correspond to the lithium content in the samples through a combination nuclear reaction analysis and energy dispersive X‐ray spectroscopy phase constitution measurements. The mechanism impacting ion conductivity was determined to be changes in the amount of LaTaO4secondary phase as driven by the processing conditions during sintering.