Characteristics of microwave absorption of Ni-Zn-ferrite/SiC hemi-crystallized composites

Makoto Nakanishi; Tomonori Shibuya; Tatsuo Fujii; Jun Takada

Characteristics of microwave absorption of Ni-Zn-ferrite/SiC hemi-crystallized composites

Makoto Nakanishi, Tomonori Shibuya, Tatsuo Fujii, Jun Takada

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

In order to develop wide-band microwave absorbers we tried to prepare composite absorbers between the magnetic loss (Ni-Zn-ferrite) and the dielectric loss (SiC) materials. The dry or wet mixtures of Ni-Zn-ferrite and polycarbosilane (PCS) were cured in air and were then subjected to pyrolysis forming of the ferrite composites. The composites produced by the wet mixing had granular structure: the PCS surrounding the ferrite particles suppressed the sintering and the grain growth of the ferrite composites during pyrolysis. The matching frequency due to the magnetic loss linearly increased with increasing the PCS content. Moreover the ferrite/SiC hemi-crystallized composite cured at 473 K for 24 hours showed wide-band absorption spectrum having the both magnetic and dielectric losses.

Original language	English
Title of host publication	Materials Issues for Tunable RF and Microwave Devices II
Pages	37-42
Number of pages	6
Publication status	Published - Dec 1 2001
Event	2000 MRS Fall Meeting - Boston, MA, United States Duration: Nov 27 2000 → Dec 1 2000

Publication series

Name	Materials Research Society Symposium Proceedings
Volume	656
ISSN (Print)	0272-9172

Other

Other	2000 MRS Fall Meeting
Country	United States
City	Boston, MA
Period	11/27/00 → 12/1/00

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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Characteristics of microwave absorption of Ni-Zn-ferrite/SiC hemi-crystallized composites. / Nakanishi, Makoto; Shibuya, Tomonori; Fujii, Tatsuo; Takada, Jun.

Materials Issues for Tunable RF and Microwave Devices II. 2001. p. 37-42 (Materials Research Society Symposium Proceedings; Vol. 656).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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abstract = "In order to develop wide-band microwave absorbers we tried to prepare composite absorbers between the magnetic loss (Ni-Zn-ferrite) and the dielectric loss (SiC) materials. The dry or wet mixtures of Ni-Zn-ferrite and polycarbosilane (PCS) were cured in air and were then subjected to pyrolysis forming of the ferrite composites. The composites produced by the wet mixing had granular structure: the PCS surrounding the ferrite particles suppressed the sintering and the grain growth of the ferrite composites during pyrolysis. The matching frequency due to the magnetic loss linearly increased with increasing the PCS content. Moreover the ferrite/SiC hemi-crystallized composite cured at 473 K for 24 hours showed wide-band absorption spectrum having the both magnetic and dielectric losses.",

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AB - In order to develop wide-band microwave absorbers we tried to prepare composite absorbers between the magnetic loss (Ni-Zn-ferrite) and the dielectric loss (SiC) materials. The dry or wet mixtures of Ni-Zn-ferrite and polycarbosilane (PCS) were cured in air and were then subjected to pyrolysis forming of the ferrite composites. The composites produced by the wet mixing had granular structure: the PCS surrounding the ferrite particles suppressed the sintering and the grain growth of the ferrite composites during pyrolysis. The matching frequency due to the magnetic loss linearly increased with increasing the PCS content. Moreover the ferrite/SiC hemi-crystallized composite cured at 473 K for 24 hours showed wide-band absorption spectrum having the both magnetic and dielectric losses.

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