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首页> 外文期刊>Chemistry: A European journal >Beyond the Structure-Property Relationship Paradigm:Influence of the Crystal Structure and Microstructure on the Li~+ Conductivity of La_(2/3)Li_xTi_(1-x)Al_xO_3 Oxides
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Beyond the Structure-Property Relationship Paradigm:Influence of the Crystal Structure and Microstructure on the Li~+ Conductivity of La_(2/3)Li_xTi_(1-x)Al_xO_3 Oxides

机译：超越结构-性质关系范式：晶体结构和微结构对La_（2/3）Li_xTi_（1-x）Al_xO_3氧化物的Li〜+电导率的影响

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摘要

The crystal structures of several oxides of the La_(2/3)Li_xTi_(1-x)Al_xO_3 system have been studied by selected-area electron diffraction,high-resolution transmission electron microscopy,and powder neutron diffraction,and their lithium conductivity has been by complex impedance spectroscopy.The compounds have a perovskite-related structure with a unit cell √2 a_p x 2a_p x √2 a_p(a_p = perovskite lattice parameter)due to the tilting of the(Ti/Al)O_6 octahedra and the ordering of lanthanum and lithium ions and vacancies along the 2a_p axis.The Li~+ ions present a distorted square-planar coordination and are located in interstitial positions of the structure,which could ex- plain the very high ionic conductivity of this type of material.The lithium conductivity depends on the oxide composition and its crystal microstructure,which varies with the thermal treatment of the sample.The micro-structure of these titanates is complex due to formation of domains of ordering and other defects such as strains and compositional fluctuations.
机译：通过选择区电子衍射，高分辨率透射电子显微镜和粉末中子衍射研究了La_（2/3）Li_xTi_（1-x）Al_xO_3体系的几种氧化物的晶体结构，并研究了锂的电导率。由于（Ti / Al）O_6八面体的倾斜和（a）p的有序排列，这些化合物具有与钙钛矿有关的结构，其晶胞为√2a_p x 2a_p x√2a_p（a_p =钙钛矿晶格参数）。镧和锂离子以及沿2a_p轴的空位。Li〜+离子呈现扭曲的方平面配位，并且位于结构的间隙位置，这可以解释此类材料的很高的离子电导率。锂的电导率取决于氧化物的组成及其晶体的微观结构，其随样品的热处理而变化。这些钛酸盐的微观结构由于有序域和其他缺陷的形成而非常复杂。作为应变和成分波动。

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