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- W3197448114 abstract "Abstract The diffusive behavior in a spinel-type Li + ion battery material, Li[Ni 1/2 Mn 3/2 ]O 4 , has been studied with positive and negative muon spin rotation and relaxation ( μ ± SR) measurements in the temperature range between 200 and 400 K using a powder sample. The implanted μ + locates at an interstitial site near O 2− ion so as to form a O–H like bond, while the implanted μ − is mainly captured by an oxygen nucleus, resulting in the formation of muonic oxygen. This means that local magnetic environments in Li[Ni 1/2 Mn 3/2 ]O 4 were investigated from the two different sites in the lattice, i.e., one is an interstitial site for μ + SR and the other is an oxygen site for μ − SR. Since both μ + SR and μ − SR detected an increase in the fluctuation rate of a nuclear magnetic field for temperatures above 200 K, the origin of this increase is clearly confirmed as Li diffusion. Assuming a random walk process with the hopping of thermally activated Li + between a regular Li site and the nearest neighboring vacant octahedral sites, a self-diffusion coefficient of Li + was found to range above 10 −11 cm 2 /s at temperatures above 250 K with an activation energy of about 0.06 eV." @default.
- W3197448114 created "2021-09-13" @default.
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- W3197448114 date "2021-09-06" @default.
- W3197448114 modified "2023-10-14" @default.
- W3197448114 title "How Li diffusion in spinel Li[Ni<sub>1/2</sub>Mn<sub>3/2</sub>]O<sub>4</sub> is seen with <i>μ</i> <sup>±</sup>SR" @default.
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- W3197448114 doi "https://doi.org/10.1515/zpch-2021-3102" @default.
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