Physical properties of the cubic spinel LiMn2O4

Bagˇcı, S.; Tütüncü, H. M.; Duman, S.; Bulut, Emrah; Özacar, Mahmut; Srivastava, G. P.

doi:10.1016/j.jpcs.2013.12.005

Cited by 17 publications

(10 citation statements)

References 44 publications

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“…Figure 3 shows the XRD patterns of the spinel LiMn2O4 synthesized from LiOH.H2O and MnOx by conventional and MA methods, measured at temperature range from room temperature down to 93K. Previous works [19,20] showed that at room temperature, stoichiometric spinel oxide, LiMn2O4, display a cubic, normal spinel structure (space group Fd-3m). The transformation should start at near room temperature (~290 K) and is shown by peak splitting of the spinel diffraction lines with decreasing temperature.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Stoichiometric Spinel-LiMn2O4

et al. 2017

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In this study, spinel LiMn2O4 powder was synthesized from LiOH.H2O and MnOx by conventional and mechanical alloying (MA) methods, followed by heat treatment at 800 °C in O2 for four hours with cooling to room temperature in the furnace at 60 °C/h. It is found that both samples do not show phase transition in low temperature, and this occurred for different reasons. In the MA sample, the presence of Fe as contamination increased the Mn valence and hindered the occurrence of phase transition. The conventional sample does not show phase transition at low temperature due to stoichiometric content, without any contamination. In general, the absence of phase transition occurred due to synthesis condition employed in this study.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Stoichiometric Spinel-LiMn2O4

et al. 2017

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“…(1) 2g ) are associated with motion of Li and O atoms, and S11 (~644 cm −1 ; A 1g ) originates from the symmetric stretching vibration of Mn-O bond in the MnO 6 octahedra. In addition, the appearance of low frequency mode S1-167 cm −1 in the spectrum may be speculated due to the scattering of the acoustic mode from other parts of Brillouin zone, as the phonon dispersion of LiMn 2 O 4 spinel shows the value close to this frequency at X-point in the Brillouin zone [41]. Also, the observed weak shoulder mode S12 may be attributed to the second order modes or second order IR modes become Raman active [42,43].…”

Section: Inelastic Light (Raman) Scattering Studymentioning

confidence: 88%

Broken translational and rotational symmetries in LiMn_1.5Ni_0.5O₄ spinel

Singh

Kumar

2019

J. Phys.: Condens. Matter

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In condensed matter physics broken symmetries and emergence of quasi-particles are intimately linked to each other. Whenever a symmetry is broken, it leaves its fingerprints, and that may be observed indirectly via its influence on the other quasi-particles. Here, we report the strong signature of broken rotational symmetry induced due to long range-ordering of spins in Mnsublattice of LiMn1.5Ni0.5O4 below Tc ~ 113 K reflected with the marked changes in the lattice vibrations using Raman scattering. In particular, the majority of the observed first-order phonon modes show a sharp shift in frequency in the vicinity of long range magnetic-ordering temperature.Phonons exist in a crystalline system because of broken translational symmetry, therefore any renormalization in the phonon-spectrum could be a good gauge for broken translational symmetry.Anomalous evolution of the few modes associated with stretching of Mn/NiO6 octahedra in the intermediate temperature range (~ 60-260 K) marked the broken translational symmetry attributed to the charge ordering. Interestingly same modes also show strong coupling with magnetic degrees of freedom, suggesting that charge-ordering and magnetic transition may be linked to each other.

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“…78 For the 16d−48f−16d hops in Figure 3 (Hops 3−5), electrostatic effects are more dominant than for the tet−oct−tet hops (Hops 1, 2), primarily due to the intermediate 48f edgesharing with an 8a. Indeed, the cation centers in edge-sharing tetrahedra are closer (∼2.15 Å experimentally between 48f and 8a in an ideal LiMn 2 O 4 -spinel 79 ) than in edge-sharing octahedra (∼2.88 Å between 16c and 16d). Consequently, the Mg barriers are consistently lower with a vacant edge-8a (Hop 5, Figure 3) compared to Mg/Mn-filled edge-8a (Hops 3, 4 in Figure 3).…”

Section: Discussionmentioning

confidence: 98%

Influence of Inversion on Mg Mobility and Electrochemistry in Spinels

Gautam,

Canepa,

Urban

et al. 2017

Meet. Abstr.

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Magnesium oxide and sulfide spinels have recently attracted interest as cathode and electrolyte materials for energy-dense Mg batteries, but their observed electrochemical performance depends strongly on synthesis conditions. Using first-principles calculations and percolation theory, we explore the extent to which spinel inversion influences Mg 2+ ionic mobility in MgMn 2 O 4 as a prototypical cathode, and MgIn 2 S 4 as a potential solid electrolyte. We find that spinel inversion and the resulting changes of the local cation ordering give rise to both increased and decreased Mg 2+ migration barriers, along specific migration pathways, in the oxide as well as the sulfide. To quantify the impact of spinel inversion on macroscopic Mg 2+ transport, we determine the percolation thresholds in both MgMn 2 O 4 and MgIn 2 S 4 . Furthermore, we analyze the impact of inversion on the electrochemical properties of the MgMn 2 O 4 cathode via changes in the phase behavior, average Mg insertion voltages and extractable capacities, at varying degrees of inversion. Our results confirm that inversion is a major performance limiting factor of Mg spinels and that synthesis techniques or compositions that stabilize the well-ordered spinel structure are crucial for the success of Mg spinels in multivalent batteries.

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Physical properties of the cubic spinel LiMn2O4

Cited by 17 publications

References 44 publications

Synthesis and Characterization of Stoichiometric Spinel-LiMn<sub>2</sub>O<sub>4</sub>

Synthesis and Characterization of Stoichiometric Spinel-LiMn<sub>2</sub>O<sub>4</sub>

Broken translational and rotational symmetries in LiMn_1.5Ni_0.5O₄ spinel

Influence of Inversion on Mg Mobility and Electrochemistry in Spinels

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Physical properties of the cubic spinel LiMn2O4

Cited by 17 publications

References 44 publications

Synthesis and Characterization of Stoichiometric Spinel-LiMn<sub>2</sub>O<sub>4</sub>

Synthesis and Characterization of Stoichiometric Spinel-LiMn<sub>2</sub>O<sub>4</sub>

Broken translational and rotational symmetries in LiMn1.5Ni0.5O4 spinel

Influence of Inversion on Mg Mobility and Electrochemistry in Spinels

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Broken translational and rotational symmetries in LiMn_1.5Ni_0.5O₄ spinel