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On the Existence of LiFeVO 4 – Tales and Imagination
Author(s) -
Clemens Oliver,
Bauer Matthias,
Haberkorn Robert,
Beck Horst Philipp
Publication year - 2011
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201100037
Subject(s) - disproportionation , xanes , extended x ray absorption fine structure , ion , crystallography , coordination number , phase (matter) , chemistry , materials science , analytical chemistry (journal) , physics , absorption spectroscopy , spectral line , catalysis , organic chemistry , optics , astronomy
In this paper, we report investigations on the synthesis of LiFeVO 4 as well as a reinvestigation of recently published research reports. Starting with compounds containing V 4+ and Fe 3+ 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 V 4+ to V 3+ and V 5+ and separation of these ions into two different phases, such as Li 0.5 + Fe (5 z –1)/2 z 3+ V 0.5 z 3+ O 4 and Li (1–0.5 z )/(1– z ) + Fe (1.5–2.5 z )/(1– z ) 3+ V 0.5/(1– z ) 5+ O 4 , with z ≈ 0.45. Additionally, XANES / EXAFS measurements were performed to determine the cation oxidation states and coordination.