Magnetic characterization of λ-MnO2 and Li2Mn2O4 prepared by electrochemical cycling of LiMn2O4

Jang, Young‐Il; Huang, Biying; Chou, F. C.; Sadoway, Donald R.; Chiang, Yet‐Ming

doi:10.1063/1.372997

Cited by 43 publications

(33 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These properties are consistent with geometrical frustration of the manganese sublattice in the λ-MnO 2 crystal structure [5]. Spin glass behavior was also observed in the λ-Li 0.07 Mn 2 O 4 sample at temperatures below 16 K [6].…”

Section: Resultssupporting

confidence: 70%

“…The λ-MnO 2 bulk sample with composition Li 0.10 MnO 2 prepared by acid treatment of LiMn 2 O 4 showed the Curie-Weiss behavior in the high-temperature susceptibility with the Curie constant 1.97 emu K/mol(Mn)Oe (µ eff = 3.97µ B ) and CurieWeiss temperature of 104 K [5]. In the λ-MnO 2 sample with composition Li 0.07 Mn 2 O 4 prepared by electrochemical cycling of LiMn 2 O 4 the high-temperature susceptibility exhibited the Curie-Weiss dependence with the Curie-Weiss temperature of -74 K and Curie constant 3.23 emu K/mol(Mn)Oe (µ eff = 3.60µ B ) [6], which is also below the theoretical spin-only value of 3.87µ B for Mn 4+ . For our sample with 3 at.% Mn, where the presence of Li was not detected, the possible reason of the lower value of the parameter C and consequently of µ eff compared to the spin-only value for Mn 4+ could be somewhat higher value of manganese concentration determined by atomic absorption method (3 at.% Mn) compared to that actually present in this sample.…”

Section: Resultsmentioning

confidence: 99%

“…At lower temperatures a complex antiferromagnetic (AFM) ordering in λ-MnO 2 [5], and very complex magnetic ordering in LiMn 2 O 4 [7] were reported. In addition, spin glass behavior was also observed at low-temperatures in λ-MnO 2 , LiMn 2 O 4 and Li 2 Mn 2 O 4 [6]. Li x Mn 2 O 4 mate- * corresponding author; e-mail: babic@vinca.rs rial has attracted a wide attention because of its utilization as cathode material for rechargeable Li batteries [3][4].…”

Section: Introductionmentioning

confidence: 99%

“…λ-MnO 2 is a metastable form of manganese dioxide whose thermodynamically stable structure is β-MnO 2 [5]. λ-MnO 2 phase is usually obtained by removal of Li from LiMn 2 O 4 by acid leaching or by electrochemical procedure [5,6], At higher temperatures Li x Mn 2 O 4 spinel has paramagnetic properties. At lower temperatures a complex antiferromagnetic (AFM) ordering in λ-MnO 2 [5], and very complex magnetic ordering in LiMn 2 O 4 [7] were reported.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Magnetic Properties of Mn-Doped Amorphous SiO₂Matrix

et al. 2011

View full text Add to dashboard Cite

Samples of Mn-doped amorphous SiO 2 matrix with manganese concentration 0.7 and 3 at.% have been prepared by a sol-gel method. Transmission electron microscopy analysis has shown that the samples contain agglomerates of amorphous silica particles 10 -20 nm in size. Two types of Mn-rich particles are dispersed in silica matrix, smaller nanoparticles with dimensions between 3 and 10 nm, and larger crystalline areas consisting of aggregates of the smaller nanoparticles. High-temperature magnetic susceptibility reveals that dominant magnetic phase at higher temperatures is λ-MnO 2 . At temperatures below T C = 43 K strong ferrimagnetism originating from the minor Mn 3 O 4 phase masks the relatively weak magnetism of λ-MnO 2 . Magnetic field dependence of the maximum in the zero-field-cooled magnetization for both the samples in the vicinity of 40 K, and a frequency shift of the real component of the AC magnetic susceptibility in the sample with 3 at.% Mn suggest that the magnetic moments of the smaller Mn 3 O 4 nanoparticles with dimensions below 10 nm are subject to thermally activated blocking process just below the Curie temperature T C . The low-temperature maximum in the zero-field-cooled magnetization observed for both the samples below 10 K indicates possible spin glass freezing of the magnetic moments in the geometrically frustrated Mn sublattice of the λ-MnO 2 crystal structure.

show abstract

Section: Resultssupporting

confidence: 70%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Magnetic Properties of Mn-Doped Amorphous SiO₂Matrix

et al. 2011

View full text Add to dashboard Cite

show abstract

“…The measured effective magnetic moment is μ eff =4.29 [31]. The randomness and frustration necessary for spin-glass-like behavior are explained by the octahedral antiferromagnetic network in the [Mn 2 ]O 4 sublattice spinel structure, combined with some magnetic disorder.…”

Section: Magnetic Properties Of Spinelsmentioning

confidence: 92%

Magnetic properties of lithium intercalation compounds

Julien

Ait-Salah

Mauger

et al. 2006

Ionics

View full text Add to dashboard Cite

Magnetic experiments are powerful tools to study fundamental properties and to check the qualities of samples. Temperature, stress, and impurities of materials can all affect magnetic properties and play an important role in the utilization of these materials for engineering applications. The estimation and analysis of the spontaneous magnetization can reveal ferromagnetic particles as impurities in samples. The shape of the temperature dependence of magnetization is indicative of the origin of the magnetic properties. However, it is necessary to correlate the χ m (T) curves and isothermal M(H) plots to achieve a complete analysis of the electronic properties of the materials. Highlights of magnetic properties of lithium intercalation compounds are briefly described. Intrinsic and extrinsic properties are considered as useful parameters to determine the purity of electrode materials for rechargeable Li-ion batteries.

show abstract