Concerning the cation distribution in MnFe2O4 synthesized through the thermal decomposition of oxalates

A single phase manganese ferrite powder have been synthesized through the thermal decomposition reaction of MnC2O4 2H2O-FeC2O4 2H2O (1:2 mole ratio) mixture in air. DTA-TG, XRD, Mossbauer spectroscopy, FT-IR and SEM techniques were used to investigate the effect of calcination temperature on the mix...

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Bibliographic Details
Published in:The Journal of physics and chemistry of solids 2004-05, Vol.65 (5), p.995-1003
Main Authors: GABAL, M. A, ATA-ALLAH, S. S
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Magnetic resonance techniques
mössbauer spectroscopy
Materials science
Materials synthesis
materials processing
Other methods of structure determination
Physics
Structure of solids and liquids
crystallography
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Summary:A single phase manganese ferrite powder have been synthesized through the thermal decomposition reaction of MnC2O4 2H2O-FeC2O4 2H2O (1:2 mole ratio) mixture in air. DTA-TG, XRD, Mossbauer spectroscopy, FT-IR and SEM techniques were used to investigate the effect of calcination temperature on the mixture. Firing of the mixture in the range 300-500 C produce ultra-fine particles of a-Fe2O3 having paramagnetic properties. XRD, Mossbauer spectroscopy as well as SEM experiments showed the progressive increase in the particle size of a-Fe2O3 up to 500 C. DTA study reveals an exothermic phase transition at 550 C attributed to the formation of a Fe2O3-Mn2O3 solid solution which persists to appear up to 1000 C. At 1100 C, the single phase MnFe2O4 with a cubic structure predominated. The Mossbauer effect spectrum of the produced ferrite exhibits normal Zeeman split sextets due to Fe3+ions at tetrahedral (A) and octahedral (B) sites. The obtained cation distribution from Mossbauer spectroscopy is (Fe0.92Mn0.08)[Fe1.08Mn0.92]O4. 27 refs.
ISSN:0022-3697
1879-2553
DOI:10.1016/j.jpcs.2003.10.059