Raman measurements of temperature dependencies of phonons in LiMnPO4

Korona, K. P.; Papierska, J.; Kamińska, M.; Witowski, A. M.; Michalska, Monika; Lipińska, L.

doi:10.1016/j.matchemphys.2011.02.027

Cited by 28 publications

(20 citation statements)

References 21 publications

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“…Figure shows the Raman spectra of the LiFe 1 − x Mn x PO 4 ( x = 0, 0.3, and 0.5) samples at 13 K. All the samples show similar Raman scattering peaks, and also, the observed Raman peaks agree well with the reported experimental and theoretical values of the phonon modes of LiFePO 4 and LiMnPO 4 olivines . This supports that all our samples have an olivine crystal structure and the Mn doping has negligible effect on the crystal structure.…”

Section: Resultssupporting

confidence: 87%

Study of spin–phonon coupling in LiFe_1 − xMn_xPO₄olivines

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Chung

Chen

et al. 2015

J Raman Spectroscopy

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LiFe1 − xMnxPO4 olivines are promising material for improved performance of Li‐ion batteries. Spin–phonon coupling of LiFe1 − xMnxPO4 (x = 0, 0.3, 0.5) olivines is studied through temperature‐dependent Raman spectroscopy. Among the observed phonon modes, the external mode at ~263 cm−1 is directly correlated with the motions of magnetic Fe2+/Mn2+ ions. This mode displays anomalous temperature‐dependent behavior near the Néel temperature, indicating a coupling of this mode with spin ordering. As Mn doping increases, the anomalous behavior becomes clearly weaker, indicating the spin–phonon coupling quickly decreases. Our analyses show that the quick decrease of spin–phonon coupling is due to decrease of the strength of spin–phonon coupling, but not change of spin‐ordering feature with Mn doping. Importantly, we suggest that the low electrochemical activity of LiMnPO4 is correlated with the weak spin–phonon coupling strength, but not with the weak ferromagnetic ground state. Our work would play an important role as a guide in improving the performances of future Li‐ion batteries. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Resultssupporting

confidence: 87%

Study of spin–phonon coupling in LiFe_1 − xMn_xPO₄olivines

Hiền

Chung

Chen

et al. 2015

J Raman Spectroscopy

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“…The films deposited at room temperature and 400°C show broad peaks in the frequency region of 1000-1200 cm − 1 . These peaks are attributed to the asymmetric stretching vibration (v 3 ) mode of the PO 4 group [38]. The broadening of the peaks indicates that the films were amorphous.…”

Section: Resultsmentioning

confidence: 99%

“…The broadening of the peaks indicates that the films were amorphous. The films deposited at 500 and 600°C show sharp bands in the frequency of 1000-1200 cm − 1 , which corresponds to the v 3 mode of the PO 4 group in the LiMnPO 4 crystal [38]. The thin film deposited at 700°C showed the additional phase at 720 cm − 1 that may be attributed to the stretching vibration of the MnO 6 octahedral in MnO 2 [39].…”

Section: Resultsmentioning

confidence: 99%

Fabrication of solid-state thin-film batteries using LiMnPO4 thin films deposited by pulsed laser deposition

et al. 2015

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Solid-state thin-film batteries using LiMnPO 4 thin films as positive electrodes were fabricated and the electrochemical properties were characterized. The LiMnPO 4 thin films were deposited on Pt coated glass substrates by pulsed laser deposition. In-plane X-ray diffraction revealed that the LiMnPO 4 thin films were well crystallized and may have a texture with a (020) orientation. The deposition conditions were optimized; the substrate temperature was 600°C and the argon pressure was 100 Pa. The electrochemical measurements indicate that the LiMnPO 4 films show charge and discharge peaks at 4.3 V and 4.1 V, respectively. The electrical conductivity of the LiMnPO 4 film was measured by impedance spectroscopy to be 2 × 10 −11 S cm −1 at room temperature. The solid-state thin-film batteries that show excellent cycle stability were fabricated using the LiMnPO 4 thin film. Moreover, the chemical diffusion of the LiMnPO 4 thin film was studied by cyclic voltammetry. The chemical diffusion coefficient of the LiMnPO 4 thin film is estimated to be 3.0 × 10 −17 cm 2 s −1 , which is approximately four orders magnitude smaller than the LiFePO 4 thin films, and the capacity of the thin-film battery was gradually increased for 500 cycles.

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“…and Amer et al ., stress mapping is used to characterize the evolution of microscopic stress distribution around a bridging ligament in current work. In crystalline materials, stress changes the vibrational frequency of the crystal symmetry, which in turn alters the Raman frequencies . Herein, Raman microprobe spectroscopy provide us an interesting method to characterize in situ bridging stress at different temperatures.…”

Section: Methodsmentioning

confidence: 99%

How Does Crack Bridging Change at Cryogenic Temperatures?

et al. 2014

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The crack bridging behaviors of silicon nitride (Si 3 N 4 ) ceramics based on the advancing cracks have been evaluated at cryogenic temperatures in contrast with those happened at ambient temperatures. R-Curve behavior of Si 3 N 4 ceramics was determined to compare the cumulative effect of bridging at 77 and 293 K. The detailed changes in crack morphologies and crack opening displacement profiles at different temperatures were investigated. The bridging stress maps around a bridging ligament were recorded by in situ Raman spectroscopy. It was found that the highest tensile stress measured at 77 K (~1.0 GPa) is much higher than that at 293 K (~0.7 GPa). The experimental results suggested that Si 3 N 4 ceramics at cryogenic temperatures possessed a higher probability of crack bridging with a higher closing force, which could make them a promising candidate for cryogenic applications.

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Raman measurements of temperature dependencies of phonons in LiMnPO4

Cited by 28 publications

References 21 publications

Study of spin–phonon coupling in LiFe_1 − xMn_xPO₄olivines

Study of spin–phonon coupling in LiFe_1 − xMn_xPO₄olivines

Fabrication of solid-state thin-film batteries using LiMnPO4 thin films deposited by pulsed laser deposition

How Does Crack Bridging Change at Cryogenic Temperatures?

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Raman measurements of temperature dependencies of phonons in LiMnPO4

Cited by 28 publications

References 21 publications

Study of spin–phonon coupling in LiFe1 − xMnxPO4olivines

Study of spin–phonon coupling in LiFe1 − xMnxPO4olivines

Fabrication of solid-state thin-film batteries using LiMnPO4 thin films deposited by pulsed laser deposition

How Does Crack Bridging Change at Cryogenic Temperatures?

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Study of spin–phonon coupling in LiFe_1 − xMn_xPO₄olivines

Study of spin–phonon coupling in LiFe_1 − xMn_xPO₄olivines