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A Mössbauer Spectrometry Study of Electronic Processes in Li_xFePO_4

Tan, H. J. and Dodd, J. L. and Fultz, B. (2009) A Mössbauer Spectrometry Study of Electronic Processes in Li_xFePO_4. ECS Transactions, 19 (27). pp. 19-30. ISSN 1938-6737. http://resolver.caltech.edu/CaltechAUTHORS:20180914-101019530

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Abstract

Li_xFePO_4 solid solutions with different lithium concentrations, x, were investigated by Mössbauer spectrometry at temperatures between 25° and 210°. The Mössbauer spectra show a temperature dependence of their isomer shifts (E_(IS)) and electric quadrupole splittings (E_Q), typical of thermally-activated, electronic relaxation processes involving ^(57)Fe ions. The activation energies for the fluctuations of E_Q and E_(IS) do not have a measurable dependence on the concentration of lithium, but varies between Fe^(3+) and Fe^(2+). Typically, for the Fe^(2+) components of the spectra, the fluctuations of E_Q occurred at lower temperatures than the fluctuations of E_(IS), with activation energy of 512 meV for E_Q and 551 meV for E_(IS). The more facile fluctuations of E_Q for Fe^(2+) are evidence for local motions of neighboring Li^+ ions.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1149/1.3265865DOIArticle
ORCID:
AuthorORCID
Fultz, B.0000-0002-6364-8782
Alternate Title:A Mössbauer Spectrometry Study of Electronic Processes in LixFePO4
Additional Information:© 2009 ECS - The Electrochemical Society. The figures and data were published in 2009 in the Journal of Physical Chemistry C, Volume 113 Page 2526, as “Mössbauer Spectrometry Study of Thermally-Activated Electronic Processes in Li_xFePO_4”. The authors thank K. Amine, I. Belharouak, and Argonne National Laboratory for providing the LiFePO_4 material. H.T. thanks J.Y.Y. Lin and L. Mauger for their help with the computational work. The authors thank General Motors for financial support.
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Funding AgencyGrant Number
General MotorsUNSPECIFIED
Record Number:CaltechAUTHORS:20180914-101019530
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180914-101019530
Official Citation:Hongjin Tan, Joanna Dodd, and Brent Fultz A Mössbauer Spectroscopy Study of Electronic Processes in LixFePO4 ECS Trans. 2009 19(27): 19-30; doi:10.1149/1.3265865
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89643
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:14 Sep 2018 20:14
Last Modified:14 Sep 2018 20:14

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