Nanocrystalline LiMn2O4 preparation and kinetics of thermal process of precursor

Wu, Wenwei; Wang, Kaituo; Li, Yongni; Wu, Xuehang; Liao, Sen; Wang, Qing

doi:10.1007/s10973-012-2740-5

Cited by 11 publications

(12 citation statements)

References 39 publications

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“…Therefore, Ni-Zn ferrites are always the focus of research. Compared to other composition Ni-Zn ferrites, Ni 0.5 Zn 0.5 Fe 2 O 4 has higher specific saturation magnetizations [5]. Ni-Zn ferrites properties were highly dependent on the composition, synthesis methods, and doped elements.…”

Section: Introductionmentioning

confidence: 91%

“…are a technologically important group of materials owing to their diverse applications in high-density magnetic recording, ferrofluids technology, biomedical drug delivery, catalysis, energy storage, gas sensors, and magnetic resonance imaging (MRI) [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Within this group, Ni-Zn ferrites is a kind of very important soft magnetic material.…”

Section: Introductionmentioning

confidence: 99%

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Structure and magnetic properties evolution of nickel–zinc ferrite with lanthanum substitution

Qin

et al. 2015

Journal of Magnetism and Magnetic Materials

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Structure and magnetic properties evolution of nickel–zinc ferrite with lanthanum substitution

Qin

et al. 2015

Journal of Magnetism and Magnetic Materials

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“…Fe 2? , as well as to the removal of oxygen from the anionic interstices of the crystalline network, according to expression [35,45]: …”

Section: Resultsmentioning

confidence: 99%

“…Thus, the reaction results in mass loss, while the opposite reaction causes mass gain. The high mass loss is characteristic of the material obtained by the polymeric precursor method and can be explained by the oxidation-reduction reaction in relation to the nickel/zinc proportion [6,45]. The reaction of Eq.…”

Section: Resultsmentioning

confidence: 99%

Rapid calcination of ferrite Ni0.75Zn0.25Fe2O4 by microwave energy

Assis¹,

Bomio²,

Nascimento³

et al. 2014

J Therm Anal Calorim

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Ferrites Ni 0.75 Zn 0.25 Fe 2 O 4 were obtained by polymeric precursor method and calcined in a short time with microwave energy to assess the morphological and microstructural characteristics. Samples were calcined at 500, 650, 800, and 950°C for 30 min in a microwave oven. The resulting powders were characterized by thermal analysis (TG/DSC), X-ray diffraction (XRD), Fourier transform infrared spectrometer, field-emission gun scanning electron microscope (FEG-SEM), and energy-dispersive X-ray spectroscopy. The XRD results showed the formation of single ferrite phase at temperature of 500°C for 30 min. The FEG-SEM analysis showed agglomerated particles with formation of non-dense longitudinal plates, with interparticle porosity and agglomerated fine particles. The rapid calcination by microwave energy demonstrated satisfactory results in relatively low temperature of 500°C for 30 min and appeared to be a promising technique for obtaining nickel-zinc ferrite powders.

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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%

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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Nanocrystalline LiMn2O4 preparation and kinetics of thermal process of precursor

Cited by 11 publications

References 39 publications

Structure and magnetic properties evolution of nickel–zinc ferrite with lanthanum substitution

Structure and magnetic properties evolution of nickel–zinc ferrite with lanthanum substitution

Rapid calcination of ferrite Ni0.75Zn0.25Fe2O4 by microwave energy

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

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