Preparation and characterization of nanocomposite MgFe2O4/SiO2

Autor:	Wen-Qin Zou, Jian-Min Hong, Li Xu
Rok vydání:	2009
Předmět:	Diffraction Nanocomposite Materials science Annealing (metallurgy) Spinel Analytical chemistry Mineralogy engineering.material Electron diffraction Nanocrystal Transmission electron microscopy engineering General Materials Science Superparamagnetism
Zdroj:	Journal of Wuhan University of Technology-Mater. Sci. Ed.. 24:354-358
ISSN:	1993-0437 1000-2413
DOI:	10.1007/s11595-009-3354-z
Popis:	Nanocomposites MgFe2O4/SiO2 were successfully synthesized by the sol-gel method in the presence of N, N-dimethylformamide (DMF). The formation of pure MgFe2O4 was confirmed by powder X-ray diffraction (XRD) and electron diffraction. The structural evolution of MgFe2O4 nanocrystals was followed by powder X-ray diffraction and IR absorption spectroscopy. The formation of spinel structure of MgFe2O4 started at 800 °C, and completed at 900 °C. The transmission electron microscopy (TEM) measurements suggest that the particle sizes increase with the increasing annealing temperature, and the mean particle sizes of the spherical samples annealed at 800 °C, 900 °C and 1 050 °C are ca. 3 nm, 8 nm and 11 nm, respectively. Magnetization measurements at room temperature and 78 K indicate superparamagnetic nature of these MgFe2O4 nanocrystals.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a80d949664aae6abcaeb1c7abbc2fef7 https://doi.org/10.1007/s11595-009-3354-z Zobrazit plný text záznamu Full text from SpringerLink