Release Time:2019-03-11  Hits:

Indexed by: Journal Article

Date of Publication: 2013-03-01

Journal: JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS

Included Journals: Scopus、SCIE、EI

Volume: 24

Issue: 3

Page Number: 968-973

ISSN: 0957-4522

Abstract: Carbonyl-iron and Fe91.2Si3.1P2.9Sb2.8 powder used as dual-fillers for thin microwave absorbers were firstly prepared by a simple mechanical mixture technique. The patterns and magnetic properties of carbonyl-iron and Fe91.2Si3.1P2.9Sb2.8 were characterized by scanning electron microscope and vibrating sample magnetometer The electromagnetic parameters were measured in the 2-7 GHz range by a HP8720B vector network analyzer. In comparison with carbonyl-iron and Fe91.2Si3.1P2.9Sb2.8 powder, the carbonyl-iron/Fe91.2Si3.1P2.9Sb2.8 composites powder exhibited excellent microwave absorption properties in the 2-7 GHz frequency range. The reflection loss was found to <-20 dB in the 2-7 GHz range for thickness of 2-5.3 mm, and the minimum reflection loss of -37 dB was observed at 5.2 GHz with a matching thickness of 2.5 mm. The excellent microwave absorption properties were firstly explained by using quantitatively coefficient of electromagnetic matching. In addition, a strong natural resonance was found in the carbonyl-iron/Fe91.2Si3.1P2.9Sb2.8 composites powder as an important reason bringing about the excellent microwave absorption.