Nanocrystalline MnFe2O4 produced by niobium doping

Kundu, T. K. ; Chakravorty, D. (1999) Nanocrystalline MnFe2O4 produced by niobium doping Journal of Materials Research, 14 (10). pp. 3957-3961. ISSN 0884-2914

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Nanosized MnFe2O4 phase with diameters in the range 13.7 to 100 nm were produced by calcination and sintering treatments in the system zNb2O5·(50 -z)MnO·50Fe2O3 with z having values between 0 and 20. Nb5+ ions are believed to give rise to vacancies in the Mn2+ sites, which break up the coupling of ferrimagnetically active oxygen polyhedra. The Curie temperature decreases as the size of the MnFe2O4 phase is reduced. This is explained on the basis of a decrease in the number of exchange pairs of the type Mn2+-Fe3+. The coercivity increases with a decrease in the size of the ferrimagnetic phase. This is believed to arise due to a decrease in saturation magnetization as the size of the MnFeO4 phase is reduced.

Item Type:Article
Source:Copyright of this article belongs to Cambridge University Press.
ID Code:65025
Deposited On:15 Oct 2011 12:15
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