Synthesis and characterization of Li11Nd18Fe4O39−δ

CHEN, Yao-Chang, REEVES-MCLAREN, Nik, BINGHAM, Paul, FORDER, Sue and WEST, Anthony R. (2012). Synthesis and characterization of Li11Nd18Fe4O39−δ. Inorganic Chemistry, 51 (15), 8073-8082.

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Official URL: http://dx.doi.org/10.1021/ic300296s
Link to published version:: 10.1021/ic300296s

Abstract

Li11Nd18Fe4O39−δ has been synthesized by the solid-state reaction of pellets, covered with powder of the same composition to avoid lithium loss, with a final reaction temperature of 950 °C. This phase has been reported previously to have various stoichiometries: Li5Nd4FeO10, Li8Nd18Fe5O39, and Li1.746Nd4.494FeO9.493. The crystal structure of Li11Nd18Fe4O39−δ is closely related to that reported previously for two of the other three compositions but contains extra Li and differences in Li/Fe site occupancies. Fe is present in a mixture of 3+ and 4+ oxidation states, as confirmed by Mössbauer spectroscopy. The oxygen content of 39 – δ is variable, depending on the processing conditions. Samples slow-cooled in air from 800 °C are semiconducting, attributed to the presence of Fe4+ ions, whereas samples quenched from 950 °C in N2 are insulating.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Corrosion Technology
Identification Number: 10.1021/ic300296s
Depositing User: Hilary Ridgway
Date Deposited: 22 Aug 2012 09:53
Last Modified: 22 Aug 2012 09:53
URI: http://shura.shu.ac.uk/id/eprint/5674

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