Cation distribution in CuFe{sub 2}O{sub 4} nanoparticles: Effects of Ni doping on magnetic properties

The Cu{sub 1−x}Ni{sub x}Fe{sub 2}O{sub 4} nanoparticles (with x = 0, 0.3, 0.5, 0.7, and 1) were synthesized by using spray co-precipitation method at annealing temperature T{sub a} = 900 °C in air for 5 h. The crystal structure, microstructure, oxidation state, and magnetic properties of the samples...

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Bibliographic Details
Published in:Journal of applied physics 2016-10, Vol.120 (14)
Main Authors: Thanh, Nguyen Kim, Loan, To Thanh, Anh, Luong Ngoc, Duong, Nguyen Phuc, Hien, Than Duc, Soontaranon, Siriwat, Thammajak, Nirawat
Format: Article
Language:English
Subjects:
ABSORPTION
ABSORPTION SPECTROSCOPY
CATIONS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COPPER IONS
COPRECIPITATION
CRYSTAL STRUCTURE
CURIE POINT
DISTRIBUTION
GRAIN SIZE
IRON IONS
LATTICE PARAMETERS
MAGNETIC PROPERTIES
MATERIALS SCIENCE
NANOPARTICLES
NICKEL IONS
SCANNING ELECTRON MICROSCOPY
SYNCHROTRONS
VIBRATING SAMPLE MAGNETOMETERS
X RADIATION
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY
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Summary:The Cu{sub 1−x}Ni{sub x}Fe{sub 2}O{sub 4} nanoparticles (with x = 0, 0.3, 0.5, 0.7, and 1) were synthesized by using spray co-precipitation method at annealing temperature T{sub a} = 900 °C in air for 5 h. The crystal structure, microstructure, oxidation state, and magnetic properties of the samples were characterized by using X-ray diffraction, synchrotron X-ray diffraction, scanning electron microscopy, X-ray absorption spectroscopy, and vibrating sample magnetometer. It was shown that all the samples have cubic structure. Lattice constant and grain size decrease, while the Curie temperature T{sub C} increases with increasing of Ni{sup 2+} content. A small amount of Fe{sup 2+} was found in all the samples. Cation distribution was determined by using a combination of magnetization measurements, extended X-ray absorption fine structure analysis, and Rietveld refinement from synchrotron X-ray diffraction data. It was indicated that Ni{sup 2+} ions occupy in octahedral site only, while Cu{sup 2+} ions distribute in both tetrahedral and octahedral sites. The variation of magnetic parameters is discussed based on Ni{sup 2+} concentration, grain size, the cation distribution, surface effect, and the presence of Fe{sup 2+} ion in the samples.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4961722