Dispersant-assisted hydrothermal synthesis of MnZn ferrites from raw oxides

MnZn-ferrite powders were prepared using hydrothermal syntheses of a homogenous mixture of the raw oxides, i.e., Fe2O3, ZnO and Mn3O4, at 280°C in air. The hydrothermal synthesis was performed in the presence of various amounts of an anionic dispersant. The final results of the hydrothermal reaction...

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Bibliographic Details
Published in:Journal of materials science 2003-07, Vol.38 (14), p.3063-3067
Main Authors: DROFENIK, M, ZNIDARSIC, A, KRISTL, M, KOSAK, A, MAKOVEC, D
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Chlorine
Dispersants
Dispersion
Electrotechnical and electronic ceramics
Exact sciences and technology
Ferrimagnetism
Hydrothermal reactions
Impurities
Iron oxides
Manganese zinc ferrites
Materials science
Phase composition
Polyvinyl alcohol
Spinel
Synthesis
Technical ceramics
Zinc ferrites
Zinc oxide
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Summary:MnZn-ferrite powders were prepared using hydrothermal syntheses of a homogenous mixture of the raw oxides, i.e., Fe2O3, ZnO and Mn3O4, at 280°C in air. The hydrothermal synthesis was performed in the presence of various amounts of an anionic dispersant. The final results of the hydrothermal reaction between the raw oxides were fine powders with a heterogeneous phase composition mostly composed of iron oxide and spinel products. The composition of the spinel products depended to a great extent on the amount of dispersant in the hydrothermally treated suspension. Without the dispersant addition, Zn ferrite and Zn manganate spinel products were formed, while in the presence of the dispersant, the ferrimagnetic MnZn-ferrite spinel product was obtained. A larger amount of the dispersant in the reaction mixture increased the conversion rate of the raw oxides into the Mn,Zn ferrite spinel product. Additionally, polyvinyl alcohol (PVA) was used during the hydrothermal synthesis in order to bind the chlorine impurities, introduced into the hydrothermally prepared powder with the raw Fe2O3. With the PVA burnout, the level of chlorine impurities was decreased by approximately 50%.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1024704625296