Crystal Chemical Analysis of Nd9.33Si6O26 and Nd8Sr2Si6O26 Apatite Electrolytes Using Aberration-Corrected Scanning Transmission Electron Microscopy and Impedance Spectroscopy
Crystal Chemical Analysis of Nd9.33Si6O26 and Nd8Sr2Si6O26 Apatite Electrolytes Using Aberration-Corrected Scanning Transmission Electron Microscopy and Impedance Spectroscopy
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使用像差校正扫描透射电子显微镜和阻抗谱对 Nd9.33Si6O26 和 Nd8Sr2Si6O26 磷灰石电解质进行晶体化学分析
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
T. White
中科院分区：
文献类型：
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作者：
T. An;T. Baikie;M. Weyland;J. Shin;P. Slater;Jun Wei;T. White
镧系硅酸盐磷灰石固体电解质中含有一维通道。与传统的氧化锆基离子导体相比，这些材料在较低的温度下表现出很大的氧迁移率，这是因为由Ln离子空位介导的间隙氧位移具有较低的激活能。对于这些非化学计量比的磷灰石，从X射线和中子粉末衍射得到的晶体结构溶液产生了平均原子排列，但这些技术也平均了局部晶格无序。大的磷灰石单晶允许使用阻抗谱来评估氧迁移的各向异性，并将这种行为与原子尺度的磁区形成或缺陷团簇聚集相关联(如果存在)。在高角环形暗场(HAADF)和亮场(BF)模式下，用像差校正的扫描电子显微镜研究了Nd9.33Si6O26和Nd8Sr2Si6O26磷灰石电解质的局域原子结构。量化的..。
Lanthanoid silicate apatite solid electrolytes contain one-dimensional channels. These materials display substantial oxygen mobility at temperatures lower than conventional zirconia-based ionic conductors because interstitial oxygen displacements, mediated by Ln cation vacancies, have a lower activation energy. For these nonstoichiometric apatites, crystal structure solutions derived from X-ray and neutron powder diffraction yield the average atomic arrangement, but these techniques also average over local lattice disorders. Large apatite single crystals permit the evaluation of oxygen migration anisotropy using impedance spectroscopy and the correlation of this behavior to atomic scale domain formation or defect cluster aggregation if present. Aberration-corrected scanning transmission electron microscopy, in both high angle annular dark field (HAADF) and bright field (BF) modalities, was applied to characterize the local atomic structure of Nd9.33Si6O26 and Nd8Sr2Si6O26 apatite electrolytes. Quantitativ...