NDLI: Simple and fast preparation of pure maghemite nanopowders through sol

Content Provider	Springer Nature Link
Author	Cannas, C. Ardu, A. Niznansky, D. Peddis, D. Piccaluga, G. Musinu, A.
Copyright Year	2011
Abstract	Pure maghemite nanopowders made up of nanocrystals with average size of 19 nm was prepared by a simple sol–gel self combustion process. The gel pH and the primer temperature turned out the key parameters for the obtaining of the maghemite phase, that often is accompanied by the most thermodynamically stable hematite. Pure maghemite was achieved only with a gel pH value of 7 and with a primer temperature between 290 and 325 °C. XRD and IR pointed out the formation of maghemite with tetragonal structure and HRTEM indicated the high degree of crystallinity of the powder. Mossbauer measurements allowed to confirm the presence of maghemite phase with Fe(octa):Fe(tetra) ratio of 1.62 which is very close to the theoretical value and the presence spin canting strongly dependent on applied magnetic field. This picture is confirmed by dc magnetic measurements.
Starting Page	266
Ending Page	274
Page Count	9
File Format	PDF
ISSN	09280707
Journal	Journal of Sol-Gel Science and Technology
Volume Number	60
Issue Number	3
e-ISSN	15734846
Language	English
Publisher	Springer US
Publisher Date	2011-08-20
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Self combustion Maghemite Mossbauer spectroscopy Magnetic measurements Ceramics, Glass, Composites, Natural Methods Optical and Electronic Materials Inorganic Chemistry Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Chemistry Materials Chemistry Biomaterials Condensed Matter Physics Electronic, Optical and Magnetic Materials

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