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- W2323761409 abstract "The temperature dependence of the 7Li NMR shift was measured for LiMn2O4, LiMn2-yNiyO4 (y = 0.1, 0.25, 0.33), LiMn2-yCoyO4 (y = 0.25, 0.5, 1.0), Li[Mn2-yLiy]O4 (y = 0.1, 0.33), and λ-MnO2 spinel oxides. The 7Li NMR shift can be separated into temperature-independent and -dependent components. The temperature-dependent shift follows the Curie−Weiss behavior of the bulk magnetic susceptibility. The temperature-independent shift is attributed to contributions from van Vleck and diamagnetic susceptibilities. Pauli susceptibility may also contribute to the temperature-independent shift in the nickel- and cobalt-substituted spinels. Supertransferred hyperfine (STH) coupling constants were derived from the 7Li NMR shifts and bulk magnetic susceptibility data. The progressive increase in average nominal manganese oxidation state from +3.5 to +4 results in an increase in the supertransferred hyperfine field at the 7Li nucleus in the lithium-substituted samples. Replacement of manganese by either cobalt or nickel also results in a larger STH field at the 7Li nuclei. The increase in STH field for the lithium-, nickel-, and cobalt-substituted spinel oxides may arise from a greater covalence in these materials relative to the parent LiMn2O4 spinel oxide." @default.
- W2323761409 created "2016-06-24" @default.
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- W2323761409 date "1998-11-19" @default.
- W2323761409 modified "2023-10-18" @default.
- W2323761409 title "Supertransferred Hyperfine Fields at <sup>7</sup>Li: Variable Temperature <sup>7</sup>Li NMR Studies of LiMn<sub>2</sub>O<sub>4</sub>-Based Spinels" @default.
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- W2323761409 doi "https://doi.org/10.1021/jp982301p" @default.
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