alpha-Manganese(III) Oxide --- a C-Type Sesquioxide of Orthorhombic Symmetry.

Norrestam, R.; Ingri, Nils; Östlund, Eric; Bloom, Gunnar D.; Hägen, G.

doi:10.3891/acta.chem.scand.21-2871

Cited by 60 publications

(27 citation statements)

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“…The first step, which is a steep one, lies in the range 835-880 ~ (2%), corresponding to the transformation of MnO 2 to Mn304 [11]. The second one, which is relatively slow (1.1%), can be related to the transformation Mn203 -*Mn30 4 [30,31]. This behaviour is in accordance with the data listed in Table 1.…”

Section: Dta and Tgsupporting

confidence: 76%

Thermal decomposition of ammonium permanganate

Radwan

El‐Hameed

Mahmoud

et al. 1987

Journal of Thermal Analysis

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The parent material, ammonium permanganate, was carefully decomposed in air at 120 ~ . The product, referred to as the starting material (SM), was then subjected to thermal treatment in air for 5 hr in the temperature range 150-1200 ~ Chemical analysis of SM indicated that the main decomposition product of NH4MnO 4 was Mn203, together with MnO2, NH4NO3, HaO and O z. Mn30 a started to form at 900 ~ The infrared spectra of various calcination products revealed the retention of NH,~ in the lattice structure up to 300 ~ and reflected the presence of excess oxygen as coordinated O~-. The TG, DTA and IRA results on SM supported the chemical analysis data. X-ray analysis was carried out for phase identification and to follow transformations and the formation of a solid solution between MnOz and MnzO3.In the literature, studies devoted to the thermal decomposition of ammonium permanganate are rare. Bircumshaw and TaYler [1] studied the explosion of NH4MnO 4 under vacuum in the temperature range 70-111 ~ in an inert oil. They concluded that the oil prevented contact between the individual crystals and damped self-heating effects, and that the decomposition products were MnO2, Mn203, NH4NO3, H20, N 2, 02, NO 2 and N20. Pavlyuchenko et al. [2] showed that decomposition was slow at ~<90 ~ very fast at/>96 ~ and explosive at 1> 100 ~ They identified MnO2, MnO, 02, H20, NO2,. NO and NHa:as thermal decomposition products.The aim o! the present investigation was to characterize the calcination products of NHgMnO 4 as a precursor for manganese oxide catalysts. This was performed through both chemical analysis and a number of physical tools.

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Section: Dta and Tgsupporting

confidence: 76%

Thermal decomposition of ammonium permanganate

Radwan

El‐Hameed

Mahmoud

et al. 1987

Journal of Thermal Analysis

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“…Prolonged heating of y-Mn0 2 in vacuum at 500°C gives, successively, y-Mn 2 03, Μη3θ 4 and finally MnO 1 6 8 . A single crystal X-ray study of a-Mn 2 03 shows that the structure clearly deviates from the body-centred cubic symmetry of bixbyite 189 . α-Μη 2 θ3 has an orthorhombic unit cell {a = 9.412, b = 9.418, c = 9.423 Â).…”

Section: Mn 2 0mentioning

confidence: 97%

Manganese

Kemmitt¹

1973

The Chemistry of Manganese, Technetium and Rhenium

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“…The X‐ray diffraction (XRD) patterns of LMO powders calcined at 650 and 750 °C (Figure 4) show the characteristic reflections of the face‐centered spinel structure (space group ${Fd\overline 3 m}$ ) . However, phase‐pure LMO was only obtained at 750 °C (sample B);12 the XRD pattern of the sample calcined at 650 °C (sample A) shows additional reflections, indicating a small quantity of Mn 2 O 3 impurities (<3 %) 5b…”

Section: Resultsmentioning

confidence: 99%

Synthesis of LiMn₂O₄ with Outstanding Lithium‐Insertion Kinetics and Long‐Term Stability

Laszczynski¹,

Zamory²,

Loeffler³

et al. 2014

ChemElectroChem

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A simple route for the synthesis of LiMn2O4 (LMO) at low calcination temperatures is proposed. The calcination temperature is known to influence the structure and surface morphology of LMO; therefore, materials synthesized at different temperatures are characterized by using different techniques. A correlation between the calcination temperature and the structure and surface morphology of the material is shown. The synthesis route described here works at low calcination temperatures (650 °C), which leads to LMO that has an excellent rate performance (110 mAh g−1) at a charge/discharge rate of 100 C, and avoids cation mixing, manganese dissolution, and Jahn–Teller distortion. The obtained morphology of octahedrons showing primarily (111) planes, ensures excellent electrochemical performance and stability.

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alpha-Manganese(III) Oxide --- a C-Type Sesquioxide of Orthorhombic Symmetry.

Cited by 60 publications

References 0 publications

Thermal decomposition of ammonium permanganate

Thermal decomposition of ammonium permanganate

Manganese

Synthesis of LiMn₂O₄ with Outstanding Lithium‐Insertion Kinetics and Long‐Term Stability

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alpha-Manganese(III) Oxide --- a C-Type Sesquioxide of Orthorhombic Symmetry.

Cited by 60 publications

References 0 publications

Thermal decomposition of ammonium permanganate

Thermal decomposition of ammonium permanganate

Manganese

Synthesis of LiMn2O4 with Outstanding Lithium‐Insertion Kinetics and Long‐Term Stability

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Product

Resources

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Synthesis of LiMn₂O₄ with Outstanding Lithium‐Insertion Kinetics and Long‐Term Stability