Neutron diffraction study and superparamagnetic behavior of ZnFe{sub 2}O{sub 4} nanoparticles obtained with different conditions

Journal Article · Fri Jul 15 04:00:00 EDT 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.04.034· OSTI ID:21580138

Blanco-Gutierrez, V; Climent-Pascual, E; Torralvo-Fernandez, M J ^[1]; Saez-Puche, R ^[1]; Fernandez-Diaz, M T ^[2]

---

1. Departamento Quimica Inorganica, Facultad de Ciencias Quimicas, Universidad Complutense de Madrid, Ciudad Universitaria, 28040 Madrid (Spain)
2. Institut Laue-Langevin, B.P. 156, F-38042 Grenoble Cedex 9 (France)

Spinel-type (S.G.= Fd3-bar m) ZnFe{sub 2}O{sub 4} 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 (Zn{sup 2+}{sub 1-x}Fe{sup 3+}{sub x})[Fe{sup 3+}{sub 2-x}Zn{sup 2+}{sub x}]O{sub 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}{sub SP}) from 7.0x10{sup 2} to 7.7x10{sup 3} {mu}{sub 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}{sub SP}. - Graphical abstract: ZnFe{sub 2}O{sub 4} nanoparticles of 19 nm obtained by the solvotermal method together with its Rietveld refined pattern. Highlights: > Solvothermally prepared ZnFe{sub 2}O{sub 4} nanoparticles.{yields} Inversion degree obtained after Rietveld refinement of neutron data.{yields} Superparamagnetic behavior.{yields} Dependence with the synthesis conditions.

• OSTI ID: 21580138
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 7 Vol. 184; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ALLOYS
BARYONS
CARBON ADDITIONS
CHARGED PARTICLES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DIFFRACTION
ELEMENTARY PARTICLES
FERMIONS
FERRIMAGNETIC MATERIALS
FERRITE
FERRITES
HADRONS
INTERACTIONS
IONS
IRON ALLOYS
IRON COMPOUNDS
IRON IONS
MAGNETIC MATERIALS
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETISM
MAGNETIZATION
MATERIALS
MINERALS
NANOSTRUCTURES
NEUTRON DIFFRACTION
NEUTRONS
NUCLEONS
OXIDE MINERALS
OXYGEN COMPOUNDS
PARTICLE SIZE
PARTICLES
PHYSICAL PROPERTIES
SCATTERING
SIZE
SPINELS
SUPERPARAMAGNETISM
SYNTHESIS
TRANSITION ELEMENT ALLOYS
TRANSITION ELEMENT COMPOUNDS
ZINC IONS