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Local Structure and Magnetic Properties of LixFePO4 Glasses

Published online by Cambridge University Press:  26 February 2011

Pawel Jozwiak ,
Jerzy Garbarczyk ,
François Gendron ,
Alain Mauger  and
Christian M Julien
Pawel Jozwiak
Affiliation:
[email protected], University Paris 6, INSP, 140 rue de Lourmel, Paris, 75015, France
Jerzy Garbarczyk
Affiliation:
[email protected], Warsaw University of Technology, Faculty of Physics, Koszykowa 75,, Warsaw, 00662, Poland
François Gendron
Affiliation:
[email protected], University Paris 6, INSP, 140 rue de Lourmel, Paris, 75015, France
Alain Mauger
Affiliation:
[email protected], CNRS, MPPU, 140 rue de Lourmel, Paris, 75015, France
Christian M Julien
Affiliation:
[email protected], University Paris 6, INSP, 140 rue de Lourmel, Paris, 75015, France
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Abstract

A series of LixFePO4 samples (0≤x≤1) have been synthesized in the vitreous state by fast quenching technique. Characterization methods include XRD, TG, FTIR, magnetic susceptibility and electrical measurements. FTIR studies reveal that in the entire composition range the local structure is identical to the olivine lattice including PO4 3− oxo-anions linked to FeO6 octahedra. Magnetic susceptibility data show that the antiferromagnetic ordering does not exist so far and the paramagnetic behaviour follows the Curie-Weiss law above 30 K. Both the Curie parameter and the Weiss temperature suggest a strong weakness of the superexchange interactions that are consistent with the analysis of infrared spectra. Electrical conductivity shows an activated conduction mechanism with Ea =0.67 eV.

Keywords

amorphousintercalationmagnetic properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 972: Symposium AA – Solid-State Ionics—2006 , 2006 , 0972-AA06-15
Copyright
Copyright © Materials Research Society 2007

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References

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