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On the Existence of LiFeVO4 – Tales and Imagination

Authors

  • Oliver Clemens,

    1. Universität des Saarlandes, Institut für Anorganische und Analytische Chemie und Radiochemie, Campus C4.1, 66123 Saarbrücken, Germany
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  • Matthias Bauer,

    1. Institut für Technische Chemie und Polymerchemie, Karlsruher Institut für Technologie - Campus Süd, Engesserstrasse 18, 76128 Karlsruhe, Germany
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  • Robert Haberkorn,

    1. Anorganische Festkörperchemie, Universität des Saarlandes, Am Markt, Zeile 3, 66125 Dudweiler, Germany
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  • Prof. Dr. Horst Philipp Beck

    Corresponding author
    1. Universität des Saarlandes, Institut für Anorganische und Analytische Chemie und Radiochemie, Campus C4.1, 66123 Saarbrücken, Germany
    • Universität des Saarlandes, Institut für Anorganische und Analytische Chemie und Radiochemie, Campus C4.1, 66123 Saarbrücken, Germany, Fax: +49-681-3024233
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  • In Memory of Professor Hans-Georg von Schnering

  • Supporting information for this article is available on the WWW under http://dx.doi.org/10.1002/zaac.201100037 or from the author.

Abstract

In this paper, we report investigations on the synthesis of LiFeVO4 as well as a reinvestigation of recently published research reports. Starting with compounds containing V4+ and Fe3+ for synthesis showed to be the best way to realize the desired composition. A single phase material could not be prepared, instead, we find a disproportionation of V4+ to V3+ and V5+ and separation of these ions into two different phases, such as Li0.5+Fe(5z–1)/2z3+V0.5z3+O4 and Li(1–0.5z)/(1–z)+Fe(1.5–2.5z)/(1–z)3+V0.5/(1–z)5+O4, with z ≈ 0.45. Additionally, XANES / EXAFS measurements were performed to determine the cation oxidation states and coordination.

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