期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 182, 期 8, 页码 2135-2140出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2009.05.032
关键词
NiFe2O4; Nanospheres; Magnetic; Reverse emulsion; Hydrothermal
资金
- Guangdong Province Government [ZB2003A07]
- Science and Technical Projects of Guangzhou [2005J1-C0241]
Nickel ferrite nanospheres were successfully synthesized by a reverse emulsion-assisted hydrothermal method. The reverse emulsion was composed of water, cetyltrimethyl ammonium bromide, polyoxyethylene(10)nonyl phenyl ether, iso-amyl alcohol and hexane. During the hydrothermal process, beta-FeO(OH) and Ni0.75Fe0.25(CO3)(0.125)(OH)(2) center dot 0.38H(2)O (INCHH) nanorods formed first and then transformed into nickel spinel ferrite nanospheres. The phase transformation mechanism is proposed based on the results of X-ray powder diffraction, transmission electron microscopy and energy-dispersive X-ray spectroscopy, etc. Nickel ferrite may form at the end of the INCHH nanorods or from the solution accompanied by the dissolution of beta-FeO(OH) and INCHH nanorods. The X-ray photoelectron spectroscopy analysis shows that a few Fe3+ ions have been reduced to Fe2+ ions during the formation of nickel ferrite. The maximum magnetization of the nickel ferrite nanospheres obtained after hydrothermal reaction for 30 h is 55.01 emu/g, which is close to that of bulk NiFe2O4. Crown Copyright (C) 2009 Published by Elsevier Inc. All rights reserved.
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