Nanocrystalline Mn–Zn ferrites from mixed oxalates: Synthesis, stability and magnetic properties

Angermann, A.; Töpfer, J.; Silva, Klebson Lucenildo Da; Becker, Klaus‐Dieter

doi:10.1016/j.jallcom.2010.08.083

Cited by 41 publications

(17 citation statements)

References 32 publications

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“…The peaks in the X-ray database standard (JCPDS-ICDD 22-1012) are slightly shifted relative to the peaks originating from the synthesized phases, which may be due to the formation of a mixture of ferrites in metastable form after gel combustion. Earlier, this phenomenon was observed by Angermann et al [25] for low-temperature ferrite synthesis. During the synthesis manganese ferrite with a large number of oxygen vacancies and Mn-Zn ferrite rich in zinc were obtained.…”

Section: Resultssupporting

confidence: 53%

“…During the synthesis manganese ferrite with a large number of oxygen vacancies and Mn-Zn ferrite rich in zinc were obtained. When the powders are heated, the defective Mn ferrite precipitates in the form of hematite and bixbyite, which co-occur with ferrite having a spinel structure [25]. At high temperatures the foreign phases again get incorporated into the crystal lattice of the spinel ferrite, which is reflected in the XRD pattern (Fig.…”

Section: Resultsmentioning

confidence: 98%

“…However, as in the case of the combustion method, unstable powders, forming hard agglomerates, can be obtained [23]. Because of their unstable character, foreign nonmagnetic phases (e.g., hematite: Fe 2 O 3 ) may occur as a result of the further thermal treatment [24,25].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of manganese–zinc ferrite obtained by thermal decomposition from organic precursors

Szczygieł

Winiarska

2013

J Therm Anal Calorim

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Mn-Zn ferrites were obtained by the sol-gel autocombustion methods. The effect of the precursor used in the sol-gel autocombustion synthesis on the ferrite's microstructure was examined. The as-obtained powders were characterized by XRD, FTIR, SEM, and TG/DTA. All ferrite powders obtained from different organic precursors, after gel autocombustion, were pure spinel phase, without secondary phases. The average crystallite size, estimated from Scherrer equation, was the smallest for ferrite obtained from a mixture of fuels/precursors (citric acid and EDTA). This ferrite powder has sponge-like microstructure with large pores, but it is less agglomerated than the material obtained from glycine as the fuel.

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Section: Resultssupporting

confidence: 53%

Section: Resultsmentioning

confidence: 98%

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Synthesis and characterization of manganese–zinc ferrite obtained by thermal decomposition from organic precursors

Szczygieł

Winiarska

2013

J Therm Anal Calorim

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“…maximum M s of 58.6 emu/g is obtained in the sample at a pH of 13. This M s value is almost the highest one reported recently [5] [19]- [22], is about one times larger than that of pH = 12. Similar results were reported by Narasimhan et al [23].…”

Section: Sample Characterizationmentioning

confidence: 44%

“…It is reported that MnZn ferrite cannot be directly obtained by using oxalate as precipitant during the co-precipitation process, and that heat treatment at certain temperature is generally needed to precursor [16] [22]. Results obtained in the present research not only simplify the preparation process of the MnZn ferrite, but also improve its quality because inclusion is easily produced during the heat treatment.…”

Section: Resultsmentioning

confidence: 67%

Direct Preparation of the Nanocrystalline MnZn Ferrites by Using Oxalate as Precipitant

Fei¹,

Yin²,

Zhang³

et al. 2015

MSCE

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Oxalate was generally used as a precipitant for synthesis of MnZn ferrites during the co-precipitation process. However, the MnZn ferrite couldn't be directly obtained and a calcination process was needed. In this research, we reported a direct preparation of the MnZn ferrite nanoparticles by using co-precipitation method, together with refluxing process. XRD measurements proved that crystallite size of the obtained samples increased with an increase in pH value of the co-precipitation solution, and that the crystallite size of about 25 nm was obtained for the sample at a pH of 13. This sample showed the maximum Ms of 58.6 emu/g, which was about one times larger than that of 12 (pH value). Calcination to the obtained samples result in an enlargement in their crystal size and an improvement in their magnetic properties with an increase in temperatures. The samples calcinated in CO2 + H2 atmosphere presented good stability, and the maximum Ms value of 188.2 emu/g was obtained for the 1100˚C-heated sample. Unfortunately, precipitation of some Fe2O3 at 800˚C suggested poor stability of the nanocrystalline MnZn ferrite in N2 atmosphere.

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Synthesis and Characterization of MnZn Ferrite Nanoparticles with Improved Saturation Magnetization

Fang

et al. 2017

J Supercond Nov Magn

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Nanocrystalline Mn–Zn ferrites from mixed oxalates: Synthesis, stability and magnetic properties

Cited by 41 publications

References 32 publications

Synthesis and characterization of manganese–zinc ferrite obtained by thermal decomposition from organic precursors

Synthesis and characterization of manganese–zinc ferrite obtained by thermal decomposition from organic precursors

Direct Preparation of the Nanocrystalline MnZn Ferrites by Using Oxalate as Precipitant

Synthesis and Characterization of MnZn Ferrite Nanoparticles with Improved Saturation Magnetization

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