Manganese ferrite synthesized from Mn(II) acetate+hematite freeze-dried powders

Bellini, J. V.; Medeiros, S.N. de; Ponzoni, Andrea; Longen, F.R.; Melo, M.A.C. de; Paesano, Andrea

doi:10.1016/j.matchemphys.2007.04.005

Cited by 17 publications

(5 citation statements)

References 27 publications

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“…N 2 atmosphere is a protective gas frequently used for solid-state reaction. It will not react with the raw materials or the obtained Li 2 MnSiO 4 , even at high temperature, because in TG curve the weight of precursor sample was not changed anymore after 400 • C. This viewpoint can also be confirmed by the work of Khomane et al [8] and Bellini et al [9]. In the TG curve, it presents three steps of weight loss.…”

Section: Methodsmentioning

confidence: 52%

Synthesis, characterization and electrochemical performance of Li2MnSiO4/C cathode material by solid-state reaction

Wang

Yang

2009

Journal of Alloys and Compounds

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Section: Methodsmentioning

confidence: 52%

Synthesis, characterization and electrochemical performance of Li2MnSiO4/C cathode material by solid-state reaction

Wang

Yang

2009

Journal of Alloys and Compounds

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“…It should be specifically noted that the direct formation of MnO from its acetate has also been observed by Bellin et al This reaction essentially occurs in the thin liquid shell surrounding the bubble (or the bubble interface) during transient collapse, where the temperature inside the bubbles reaches extreme values (∼5000 K), and the temperature in the thin liquid shell can reach up to 600 K . To support the formation of MnO from its acetate, we have also analyzed the chemical equilibrium by Gibbs energy minimization for the Mn–acetate and water system for a temperature of 600 K in the Supporting Information provided with the manuscript.…”

Section: Methodsmentioning

confidence: 72%

Sonochemical Synthesis and Characterization of Manganese Ferrite Nanoparticles

Goswami

Choudhury

Chakma

et al. 2013

Ind. Eng. Chem. Res.

104

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This paper reports sonochemical synthesis and characterization of Mn–ferrite nanoparticles using acetates precursors. Mn–ferrite synthesis requires external calcination of oxide precursors formed by sonication. pH does not play a dominant role in the synthesis. Collisions between metal oxide particles induced by shock waves generated by transient cavitation are unable to cross the activation energy barrier for the formation of ferrite. The calcination temperature is a significant parameter that influences the magnetic properties of ferrites. The size, coercivity, and saturation magnetization of ferrite particles increases with the calcination temperature. Ferrites formed at calcination temperatures of 650, 750, and 850 °C show ferromagnetic behavior with easy axis magnetization. Calcination at 950 °C leads to the formation of rods with grain growth that introduces large shape anisotropy. The magnetization curve for rods does not reach saturation, indicating paramagnetic behavior. The cause leading to this effect is nonalignment of the easy axis of magnetization with the direction of the applied magnetic field, resulting in hard axis magnetization.

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“…In recent years, spinel ferrite nanoparticles have been prepared using various methods, such as coprecipitation [5], the reverse micelle method [6], microwave plasma synthesis, sol-gel method [7][8][9], ultrasound irradiation [10], freeze drying [11], thermal decomposition of organometallic and coordination compounds [12], hydrothermal method [5,[13][14][15] and microwave assisted route [16,17].…”

Section: Introductionmentioning

confidence: 99%