Mechanochemically activated synthesis of nanostructured NiFe2O4

Powdery NiFe 2 O 4 has been obtained by mechanothermal treatment. Nickel and iron hydroxides are used as initial compounds. For comparison the initial compounds are calcinated without mechanical treatment (samples obtained by direct heating). The characterization of the samples is carried out by XRD...

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Bibliographic Details
Published in:Inorganic materials 2011-05, Vol.47 (5), p.527-530
Main Authors: Cherkezova-Zheleva, Z., Blaskov, V., Mitov, I., Klissurski, D., Radev, D., Tsokov, P.
Format: Article
Language:English
Subjects:
Calcination
Calcines
Chemistry
Chemistry and Materials Science
Ferrite
Heating
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Iron
Materials Science
Mossbauer spectroscopy
Nickel ferrites
Synthesis
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Summary:Powdery NiFe 2 O 4 has been obtained by mechanothermal treatment. Nickel and iron hydroxides are used as initial compounds. For comparison the initial compounds are calcinated without mechanical treatment (samples obtained by direct heating). The characterization of the samples is carried out by XRD analysis and Mössbauer spectroscopy. It is established that single phase NiFe 2 O 4 is formed after mechanical activation (5 h) and calcination at 773 K. The ferrite synthesized at this temperature contains a smaller quantity of Fe 3+ ions in tetrahedral position (31%) than is the case of conventional nickel ferrite (50%). The number of tetrahedrally coordinated iron ions increases with enhancement of the synthesis temperature, approaching the distribution of the tetrahedral and octahedral positions typical of conventional NiFe 2 O 4 . The samples obtained by direct heating contain unreacted NiO and α-Fe 2 O 3 even after calcinations at 1073 K.
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168511050074