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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >1/2+1/2xLi1/2-1/2xTi1-xAlxO3 (0?≤?x?≤?1) solid solution. A new example of percolative system in fast ion conductors]]>
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1/2+1/2xLi1/2-1/2xTi1-xAlxO3 (0?≤?x?≤?1) solid solution. A new example of percolative system in fast ion conductors]]>

机译：<！[CDATA [研究AT 1/2 + 1 / 2X LI 1 / 2-1 / 2x ti 1-x al x o 3 （0？≤x≤1）固溶体。 快速离子导线渗透系统的新示例]]>

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Abstract The synthesis by solid state reaction of new fast ion conductors with perovskite structure was carried out. The crystal structure and electric properties of the La1/2+1/2xLi1/2-1/2xTi1-xAlxO3 (0?≤?x?≤?1) solid solution were investigated by powder X-ray diffraction and impedance spectroscopy. All compositions of the La1/2Li1/2TiO3-LaAlO3 system, exhibited a single cubic perovskite structure (ac?≈?3.87–3.79??; SG Pm-3m). The progressive decrease in the unit cell parameters agrees with the lower ionic radii of Al3+ in relation to Ti4+, which are allocated in the same octahedra. An upward deviation from the lineal ideal solid solution behavior described by Vegard's law was observed and it was tentatively associated with a volume excess created by solid dilution of non-isovalent cations. Structural features were deduced from Rietveld analysis of XRD patterns. Ti(Al)O6 octahedra are regular and La/vacancies are randomly distributed in A-site of the perovskite. The conductivity decreased almost four orders of magnitude with the Li content. This important decrease on the conductivity was attributed to the charge carrier (Li+) decrease and the blockade of the perovskite conduction pathways by La ions, according to a three dimensional percolative process. In consequence we present here a new example of percolative system of ionic conductors and the results confirm the important role played by effective vacant A-sites, neff?=?[Li]?+?nA, on Li conductivity of this fast ion conductors family with perovskite structure. Highlights ? La1/2+1/2xLi1/2-1/2xTi1-xAlxO3 (0?≤?x?≤?1) exist as solid solution in all range. ? Conductivity decreased more than 4 orders of magnitude as Li content decreases. ? This new percolative system shows the important role of effective vacant A-sites. ]]>
机译：<！[CDATA [ 抽象 通过钙钛矿结构进行新的快离子导体的固态反应的合成。 LA 1/2 + 1 / 2x LI 1 / 2-1 / 2x的晶体结构和电气性能 TI 1-X AL X O 3 （0≤≤≤α1）固溶体。 LA 1/2 LI 1/2 TIO 3 -LAALO 3 系统，展出单个立方蠕动结构（A C ？≈α3.87-3.79 ??; sg pm - 3m ）。单位细胞参数的逐渐减少与Al 3 + 的下离子半径同意，同时有关Ti 4+ ，其在同一八面体中分配。观察到vegard定律描述的线性理想固体溶液行为的向上偏离，并且暂时与通过稀释的非依值阳离子的固体稀释产生的体积过量相关。从XRD模式的RIETVELD分析推导出结构特征。 TI（AL）O 6 八面化八德拉是常规的，LA /空缺被随机分布在PEROVSKITE的现场。电导率随着LI含量降低了几乎四个数量级。导电性的这种重要降低归因于电荷载体（Li + ）减少和La离子的钙钛矿传导途径的阻断，根据三维渗透过程。结果，我们在这里介绍离子导体的渗透系统的新例子，结果证实了有效空置A-Sites的重要作用，N EFF ？=？ [li]？+？n a ，在这种快速离子导线系列与Perovskite结构的li电导率。 突出显示 ？ la 1/2 + 1 / 2x li 1/2-1 / 2x TI 1-x al x o 3 （0？≤≤x≤≤1）作为各种范围的固溶体存在。 ？ 电导率随着LI内容减少而减少了超过4个级数。 ？ 这一新的渗透系统显示了有效空置的重要作用a-sites。 ]]>

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