Microwave absorption properties of Fel2O3 nanoembedments prepared by mechanosynthesis

The iron nanoparticles embedded in alumina powder (Fel2O3 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 l...

Full description

Saved in:
Bibliographic Details
Published inMaterials chemistry and physics Vol. 130; no. 1-2; pp. 615 - 618
Main Authors Zhang, Zi-dong, Shi, Zhi-cheng, Fan, Run-hua, Gao, Meng, Guo, Jing-yan, Qi, Xiao-gang, Sun, Kang-ning
Format Journal Article
LanguageEnglish
Published 17.10.2011
Subjects
Microwave absorbers
Microwave absorption
Microwaves
Nanocomposites
Nanomaterials
Nanoparticles
Nanostructure
Spectra
Online AccessGet full text

Cover

More Information
Summary:The iron nanoparticles embedded in alumina powder (Fel2O3 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 -21.4dB at a higher frequency of a arrow right 413.3GHz as the thickness is 1.4mm. The coexistence of superparamagnetic loss and multiresonant loss is responsible for microwave absorption. The Fel2O3 nanoembedments may become attractive candidates for a new type of microwave absorber.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
content type line 23
ObjectType-Feature-1
ISSN:0254-0584
DOI:10.1016/j.matchemphys.2011.07.033