Delithiated Fe1-xMgxPO4 cathode materials: Structural, magnetic, and Mössbauer studies

Fe1-xMgxPO4 (x = 0.01, 0.05, and 0.1) cathode materials are synthesized by a two-step method, which combines the solid-state reaction method and the chemical lithium deintercalation method. A study was conducted to investigate the structural and the magnetic properties of Fe1-xMgxPO4. The crystallin...

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Bibliographic Details
Published inAIP advances Vol. 10; no. 1; pp. 015214 - 015214-5
Main Authors Choi, Hyunkyung, Kim, Jeonghun, Seo, Jae Yeon, Kim, Chul Sung
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 01.01.2020
AIP Publishing LLC
Subjects
Antiferromagnetism
Cathodes
Electrode materials
Functional analysis
Lithium
Magnesium
Magnetic properties
Magnetometers
Mossbauer spectroscopy
Organic chemistry
Quadrupoles
Resonance absorption
Spectrum analysis
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Summary:Fe1-xMgxPO4 (x = 0.01, 0.05, and 0.1) cathode materials are synthesized by a two-step method, which combines the solid-state reaction method and the chemical lithium deintercalation method. A study was conducted to investigate the structural and the magnetic properties of Fe1-xMgxPO4. The crystalline structure of the samples was analyzed by X-ray diffractometer (XRD) using the Rietveld refinement. The magnetic properties of the samples were determined from vibrating sample magnetometer (VSM) and Mösssbauer spectroscopy, including their magnetic interactions, Fe ion states, and structural ordering. The Néel temperature (TN) of Fe1-xMgxPO4 decreases with the increase of the Mg content due to the weakening of the antiferromagnetic exchange. Furthermore, for Fe1-xMgxPO4, the effective moment value decreases as expected with increasing Mg content. Mössbauer spectroscopy measurements at different temperatures were made. The spectrum at 295 K was fitted with a doublet, which has an isomer shift of δ = 0.32 – 0.43 mm/s (Fe3+). The large value of the electric quadrupole splitting (∆EQ = 0.95 – 1.87 mm/s) is explained by the asymmetric local environment of the Fe ions. Below the TN, the spectra of Fe1-xMgxPO4 in the eight resonance absorption lines (including two relatively small intensities) were analyzed. We can obtain a spin value for Fe ions (S = 5/2) of Fe0.9Mg0.1PO4 from the Brillouin functional analysis.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.5130033