期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 184, 期 7, 页码 1608-1613出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2011.04.034
关键词
Zn-ferrite; Nanoparticles; Neutron diffraction; Inversion degree; Superparamagnetism
资金
- Ministerio de Ciencia e Innovacion [MAT 2010-19460]
- Universidad Complutense de Madrid
Spinel-type (S.G. = Fd $(3) over bar $m) ZnFe2O4 fine particles with sizes from 4 to 19 nm prepared by solvothermal and microwave-assisted solvothermal methods have been studied by neutron powder diffraction at room temperature. The cation distribution corresponding to mixed spinel structure (Zn1-x2+Fex3+) [Fe2-x3+Znx2+]O-4 along with the unit cell parameter has been estimated after Rietveld refinement of the obtained neutron diffraction data for all the samples. It has been found that the inversion degree parameter (x) takes values between 0.11 and 0.20 depending not only on the particle size but also on the synthesis conditions as well. All the samples behave as superparamagnetic with an effective magnetic moment per particle (mu(SP)) from 7.0 x 10(2) to 7.7 x 10(3) mu(B). The sample obtained by microwave assistance displays a different magnetic behavior as the ZFC and FC magnetic susceptibility and the magnetization versus applied field hysteresis loop measured at 5 K suggest. This is related with the dipole interactions that are a consequence of the higher inversion degree and mu(SP). (C) 2011 Elsevier Inc. All rights reserved.
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