Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 130, Issue 1-2, Pages 615-618Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2011.07.033
Keywords
Composite materials; Powder metallurgy; Magnetometer; Magnetic properties
Categories
Funding
- National Natural Science Foundation of China [50772061]
- Program for New Century Excellent Talents in University [NCET-10-518]
- Provincial Science and Technology Development Project of Shandong [2007GG10003007, 2007BS04032]
- Independent Innovation Foundation of Shandong University [IIFSDU-2010JQ002, GIIFSDU-YYX10011]
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The iron nanoparticles embedded in alumina powder (Fe@Al2O3 nanoembedments) were prepared by a mechanochemical process. Their potential for microwave absorber is evaluated. The insulating embedment provides encapsulation and prevents oxidation and agglomeration of metal nanoparticles. The hysteresis loop of such nanoembedments at room temperature exhibits a superparamagnetic behavior, while the microwave permeability spectra show a multiresonance behavior. The maximum reflection loss can reach -21.4 dB at a higher frequency of similar to 13.3 GHz as the thickness is 1.4 mm. The coexistence of superparamagnetic loss and multiresonant loss is responsible for microwave absorption. The Fe@Al2O3 nanoembedments may become attractive candidates for a new type of microwave absorber. (C) 2011 Elsevier B.V. All rights reserved.
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