Magnetic properties of the chemically delithiated LixMn2O4 with 0.07≤x≤1 |
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Authors: | Kazuhiko Mukai Jun Sugiyama Yutaka Ikedo Daniel Andreica Alex Amato |
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Institution: | a Toyota Central Research and Development Laboratories, Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan b Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institut, PSI Villigen CH-5232, Switzerland c Faculty of Physics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania |
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Abstract: | Magnetism for the LixMn2O4 samples with 0.07≤x≤1, which are prepared by a chemical reaction in HNO3 solution, is investigated by direct current susceptibility (χ) and muon-spin rotation/relaxation (μSR) measurements. The effective magnetic moment (μeff) of Mn ions decreases monotonically with decreasing x, indicating that Mn3+ ions with S=2 ( ) are oxidized to Mn4+ ions with S=3/2 ( ) with decreasing x. On the other hand, as x decreases from 1 to 0.6, the Curie-Weiss temperature (Θp) increases monotonically from ∼−260 to −100 K, and then levels off to −100 K with further decreasing x. This indicates that the antiferromagnetic interaction is dominant in the whole x range. For the x=0.48 sample, the temperature dependence of χ in field-cooling mode clearly deviates from that in zero-field-cooling mode below ∼63 K (=Tm). Furthermore, the hysteresis loop is observed in the magnetization vs. field curve at 5 K. Since the zero-field μSR spectrum is well fitted by a strongly damped oscillation function, the Mn moments for the x=0.48 sample are in a highly disordered fashion down to the lowest temperature measured. |
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Keywords: | Lithium manganese oxide Spinel Magnetism Muon spin rotation/relaxation Lithium-ion battery |
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