Formation and magnetic behaviour of manganese oxide nanoparticles

Thota, Subhash; Prasad, Bhagwati; Kumar, Jitendra

doi:10.1016/j.mseb.2010.01.049

Cited by 55 publications

(42 citation statements)

References 49 publications

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“…2MnO 2 →Mn 2 O 3 +1/2O 2 ↑ (500 °C 650 °C) 3Mn 2 O 3 →2Mn 3 O 4 +1/2O 2 ↑ (900 °C 980 °C) It is noted that all Mn-oxides possibly generated in the above procedure, i.e., MnO 2 , Mn 2 O 3 and Mn 3 O 4 , are nonmagnetic in our measuring temperature range from 60 K to 300 K according to Ref. [21] and Ref. [22].…”

Section: Resultsmentioning

confidence: 73%

Ferromagnetic behavior in Mn‐doped LaAlO₃ single crystals

Yang

Xue

et al. 2011

Phys. Status Solidi C

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LaAlO3 single crystals were doped with transition element Mn by thermal diffusion method for investigation of ferromagnetism. With increasing the annealing temperature TN, ferromagnetism begins to appear when TN equals 750 °C, which is indicated by small magnetic hystersis (M ‐H) loop with low coercive field of 60 Oe measured at 60 K. After TN arrives at 1300 °C, obvious M ‐H loop can be observed at 60 K and the M ‐T curve displays sharp Curie phase transition, which shows an unambiguous ferromagnetism. A bound magnetic polaron model was proposed to understand the observed ferromagnetic behavior in Mn‐doped LaAlO3 single crystals. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Resultsmentioning

confidence: 73%

Ferromagnetic behavior in Mn‐doped LaAlO₃ single crystals

Yang

Xue

et al. 2011

Phys. Status Solidi C

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“…Among the various crystalline phases of manganese oxides, such as MnO, MnO 2 , Mn 2 O 3 , and Mn 3 O 4 , the manganese sesquioxide, Mn 2 O 3 , is of potential interest [3]. It has found promising application in rechargeable batteries, magnetic sensors, super capacitors, and so on [4][5][6][7]. Based on this fact, more research is ongoing in its synthesis and characterization.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Photocatalytic Performance of Mesoporous α-Mn₂O₃ Microspheres Prepared via a Precipitation Route

Pudukudy

Yaakob

2016

Journal of Nanoparticles

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-Mn 2 O 3 microspheres with high phase purity, crystallinity, and surface area were synthesized by the thermal decomposition of precipitated MnCO 3 microspheres without the use of any structure directing agents and tedious reaction conditions. The prepared Mn 2 O 3 microspheres were characterized by Fourier transform infrared (FTIR) spectroscopy, powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and Brunauer-Emmett-Teller (BET) and photoluminescence (PL) studies. The complete thermal transformation of MnCO 3 to Mn 2 O 3 was clearly shown by the FTIR and XRD analysis. The electron microscopic images clearly confirmed the microsphere-like morphology of the products with some structural deformation for the calcined Mn 2 O 3 sample. The mesoporous texture generated from the interaggregation of subnanoparticles in the microstructures is visibly evident from the TEM and BET studies. Moreover, the Mn 2 O 3 microstructures showed a moderate photocatalytic activity for the degradation of methylene blue dye pollutant under UV light irradiation, using air as the potential oxidizing agent.

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“…The thermal decomposition of 3d-transition metal oxalates has been subject of many investigations during the last decade due to their wide application as precursors for nanosized oxide materials [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. A special attention is paid to the manganese oxides, which have a wide range of technological application with respect to their magnetic, electric and catalytic properties.…”

Section: Introductionmentioning

confidence: 99%

“…A special attention is paid to the manganese oxides, which have a wide range of technological application with respect to their magnetic, electric and catalytic properties. Sparingly soluble manganese oxalate is an appropriate precursor for their preparation which explains the growing interest to the utilization and investigation of its thermolysis [1][2][3][4][5][6][7][8][9][10][11][17][18][19]. Different in morphology, structure and oxidation state manganese oxides have been obtained by varying the preparation method, nature of solvents and/or using different surfactants at oxalate synthesis, changing the atmosphere, temperature and duration of heat treatment [1-9, 11, 17, 18].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and decomposition mechanism of γ-MnC2O4·2H2O rods under non-isothermal and isothermal conditions

Donkova

Avdeev

2015

J Therm Anal Calorim

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The thermolysis of the ill-known c-MnC 2 O 4 Á 2H 2 O is investigated applying DTA, TG, DSC, FT-IR, SEM, BET and Rietveld XRD phase analyses for thorough characterization of the starting compound and its calcined products. The dehydration proceeds in one step with DH = 149 kJ mol -1 (reported for the first time). Primary decomposition product is Mn 3 O 4 ([Mn 2? Mn 2 3? ]O 4 ) with high specific surface area. During its formation, the oxidation of Mn 3? species to Mn 4? starts, followed by oxidation of Mn 2? -Mn 3? , thus leading to formation of metastable Mn 5 O 8 ([Mn 2 2? Mn 3 4? ]O 8 ) and Mn 2 O 3 . Before complete precursor decomposition under non-isothermal conditions, the reduction of Mn 4? -Mn 3? occurs, forming an additional amount of Mn 3 O 4 . After isothermal annealing of c-MnC 2 O 4 Á2H 2 O in the range of 573-823 K, Mn 3 O 4 is detected as a major product in all samples. Mn 5 O 8 is identified after calcination at 573, 673, 723 K, and its amount decreases gradually in this order. Cubic Mn 2 O 3 appears after heat treatment at 673 K; its content varies between 13 and 23 % in the range of 673-773 K and becomes close to that of Mn 3 O 4 at 823 K. The application of the same experimental conditions as in the investigation of a-MnC 2 O 4 Á2H 2 O and MnC 2 O 4 Á3H 2 O allows an objective comparison of the nature and the peculiarities of the thermal decomposition of different crystal forms of manganese oxalate.

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Formation and magnetic behaviour of manganese oxide nanoparticles

Cited by 55 publications

References 49 publications

Ferromagnetic behavior in Mn‐doped LaAlO₃ single crystals

Ferromagnetic behavior in Mn‐doped LaAlO₃ single crystals

Synthesis, Characterization, and Photocatalytic Performance of Mesoporous α-Mn₂O₃ Microspheres Prepared via a Precipitation Route

Synthesis and decomposition mechanism of γ-MnC2O4·2H2O rods under non-isothermal and isothermal conditions

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Formation and magnetic behaviour of manganese oxide nanoparticles

Cited by 55 publications

References 49 publications

Ferromagnetic behavior in Mn‐doped LaAlO3 single crystals

Ferromagnetic behavior in Mn‐doped LaAlO3 single crystals

Synthesis, Characterization, and Photocatalytic Performance of Mesoporous α-Mn2O3 Microspheres Prepared via a Precipitation Route

Synthesis and decomposition mechanism of γ-MnC2O4·2H2O rods under non-isothermal and isothermal conditions

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Ferromagnetic behavior in Mn‐doped LaAlO₃ single crystals

Ferromagnetic behavior in Mn‐doped LaAlO₃ single crystals

Synthesis, Characterization, and Photocatalytic Performance of Mesoporous α-Mn₂O₃ Microspheres Prepared via a Precipitation Route