Preparation of coprecipitated NiZn ferrite

Rigby, E. B.; Kehr, W.; Meldrum, C.

doi:10.1109/tmag.1984.1063248

Cited by 7 publications

(1 citation statement)

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“…Several nonconventional routes for high-quality ferrite powder preparation have been used or are under development, such as the sol-gel method, 1 the hydrothermal method, 2 the aerosol method, [3][4][5] and the coprecipitation method. [6][7][8][9][10][11] Among them, the coprecipitation technique, because of its easy operation and because it is ready for mass production, is the most common one adopted in the production of ferrite powder. The coprecipitation technique used in preparing ferrite powder involves preparation of homogeneous solution that contains the required ratio of cations, precipitation of insoluble precursors of the ferrites by adding precipitating agents, separation of the solid precipitates from the liquid solution, removal of the soluble residuals by washing and drying, and formation of the ferrite powder by pyrolysis.…”

Section: Introductionmentioning

confidence: 99%

Ultrafine MnFe₂O₄ powder preparation by combusting the coprecipitate with and without Mg²⁺ or Zn²⁺ additives

Yu¹,

Zhong²

2000

J. Mater. Res.

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Ultrafine MnFe2O4 powder with its crystallites less than 100 nm was prepared using a combustion process. The coprecipitates containing the stoichiometric amount of Mn2+ and Fe3+ to form MnFe2O4 were prepared by dissolving the required metallic nitrates in de-ionized water and adding NH4OH to adjust the pH of the solutions to 9. The collected dried precipitates were then heated up to predetermined temperatures and then quickly contacted with the acetone spray. Upon contacting with the heated precipitates, the acetone spray was ignited. The combustion of acetone caused the precipitates to form crystalline MnFe2O4 without chemical segregation. The crystallinity of MnFe2O4 powder so obtained depended on the ignition temperature of acetone spray. MnFe2O4 powder obtained at acetone ignition temperature of 773 K had higher crystallinity than that obtained at acetone ignition temperature of 523 K. The presence of a small amount of Mg2+ or Zn2+ in the composition of the coprecipitates promoted the mobility of constituent ions of the combusted powder and resulted in bigger MnFe2O4 crystallites at a lower acetone ignition temperature.

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Section: Introductionmentioning

confidence: 99%

Ultrafine MnFe₂O₄ powder preparation by combusting the coprecipitate with and without Mg²⁺ or Zn²⁺ additives

Yu¹,

Zhong²

2000

J. Mater. Res.

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Coprecipitation of Oxalates: An Easy and Reproducible Wet‐Chemistry Synthesis Route for Transition‐Metal Ferrites

et al. 2013

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In this work, an easy, quick and reproducible wet-synthesis coprecipitation route starting from oxalate precursors was optimised to synthesise cobalt, nickel, zinc and magnesium spinel ferrites CoFe2O4, NiFe2O4, ZnFe2O4 and MgFe2O4, as well as the manganese perovskite ferrite MnFeO3. Crystalline purity and crystallite sizes ranging from 30 to 190 nm were investigated by means of powder X-ray diffraction, and uniform morphology of the particles was shown through transmission electron microscopy. The chosen synthetic route afforded an excellent stoichiometric control over the products, as confirmed by combined X-ray photoelectron spectroscopy and inductively coupled plasma atomic emission spectroscopy analyses. The site geometry, degree of inversion in the spinels and chemical environments in the ferrites were explored by Mössbauer spectroscopy. The thermal evolution of the compounds during calcination and the decomposition pattern of the oxalates were studied through differential scanning calorimetry coupled with thermogravimetric analysis as well as in situ temperature-programmed X-ray diffraction. Magnetic properties of these oxides, as well as the transition of the perovskite from paramagnetic to ferrimagnetic behaviour at low temperatures, were investigated by superconducting quantum interferometer magnetometr

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Effect of the Fe/Ba Ratio and Sintering Temperature on Microstructure and Magnetic Properties of Barium Ferrites Prepared by Hydrothermal Method

Liu

Feng

et al. 2017

J Supercond Nov Magn

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Preparation of coprecipitated NiZn ferrite

Cited by 7 publications

References 1 publication

Ultrafine MnFe₂O₄ powder preparation by combusting the coprecipitate with and without Mg²⁺ or Zn²⁺ additives

Ultrafine MnFe₂O₄ powder preparation by combusting the coprecipitate with and without Mg²⁺ or Zn²⁺ additives

Coprecipitation of Oxalates: An Easy and Reproducible Wet‐Chemistry Synthesis Route for Transition‐Metal Ferrites

Effect of the Fe/Ba Ratio and Sintering Temperature on Microstructure and Magnetic Properties of Barium Ferrites Prepared by Hydrothermal Method

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Preparation of coprecipitated NiZn ferrite

Cited by 7 publications

References 1 publication

Ultrafine MnFe2O4 powder preparation by combusting the coprecipitate with and without Mg2+ or Zn2+ additives

Ultrafine MnFe2O4 powder preparation by combusting the coprecipitate with and without Mg2+ or Zn2+ additives

Coprecipitation of Oxalates: An Easy and Reproducible Wet‐Chemistry Synthesis Route for Transition‐Metal Ferrites

Effect of the Fe/Ba Ratio and Sintering Temperature on Microstructure and Magnetic Properties of Barium Ferrites Prepared by Hydrothermal Method

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Ultrafine MnFe₂O₄ powder preparation by combusting the coprecipitate with and without Mg²⁺ or Zn²⁺ additives

Ultrafine MnFe₂O₄ powder preparation by combusting the coprecipitate with and without Mg²⁺ or Zn²⁺ additives