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Novel LiFeTiO_4 Polymorph with a Tunnel Structure: Synthesis, Structural and Electrochemical Characterization

机译:具有隧道结构的新型LiFeTiO_4多晶型物:合成,结构和电化学表征

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摘要

New polymorph modification of LiFeTiO_4 with the calcium ferrite structure was prepared by low temperature ion exchange. This compound can be considered as a model system for multiple electron cycling per Fe atom, i.e. Fe~(2+) (Li_(1+x)FeTiO_4) / Fe~(4+) (Li_(1-x)FeTiO_4). The crystal structure of LiFeTiO_4 was determined using Rietveld refinement (Pnma, a = 8.9498(6) A, b = 2.9528(6) A, c = 10.7457(8) A). LiFeTiO_4 in the calcium ferrite type structure was found to be thermodynamically unstable, transforming to the known spinel LiFeTiO_4 polymorph at higher temperatures.
机译:通过低温离子交换,制备了具有铁酸钙结构的LiFeTiO_4多晶型物。可以将该化合物视为每个Fe原子进行多个电子循环的模型系统,即Fe〜(2+)(Li_(1 + x)FeTiO_4)/ Fe〜(4+)(Li_(1-x)FeTiO_4)。 LietTiO_4的晶体结构使用Rietveld精炼法确定(Pnma,a = 8.9498(6)A,b = 2.9528(6)A,c = 10.7457(8)A)。发现铁酸钙型结构中的LiFeTiO_4在热力学上是不稳定的,在较高温度下转变成已知的尖晶石LiFeTiO_4多晶型物。

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  • 会议地点 Boston MA(US)
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    Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA;

    Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA;

    Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA;

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