GHz Range Electromagnetic Wave Absorption Properties of M and W-Type Two Phase Hexaferrite
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- Maeda Yoshiaki
- Department of Materials Science, Graduate School of Engineering, Tohoku University
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- Sugimoto Satoshi
- Department of Materials Science, Graduate School of Engineering, Tohoku University
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- Book David
- Department of Materials Science, Graduate School of Engineering, Tohoku University
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- Ota Hiroyasu
- Department of Materials Science, Graduate School of Engineering, Tohoku University
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- Kimura Masashi
- Department of Materials Science, Graduate School of Engineering, Tohoku University
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- Nakamura Hajime
- Department of Materials Science, Graduate School of Engineering, Tohoku University
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- Kagotani Toshio
- Department of Materials Science, Graduate School of Engineering, Tohoku University
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- Homma Motofumi
- Department of Materials Science, Graduate School of Engineering, Tohoku University
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説明
The electromagnetic wave absorption properties of BaZn2xFe10.8+4x(Sn0.5Mn0.5)1.2O19+8x (x=0.25∼0.75) sintered bodies, consisting of BaM and BaZn2W-type hexaferrite phases, were studied. The relative complex permittivity values hardly changed, with respect to composition (x). In the frequency dispersion of the relative complex permeability of some of the samples, two peaks were observed at frequencies centred around 14 and 17 GHz. The intensities of these permeability peaks at 14 and 17 GHz, increased and decreased with increasing x, respectively. The Reflection Loss (R.L.) was less than −20 dB, and almost the same matching thickness (dm) was obtained in all of the samples. However, the bandwidth for R.L.≤−20 dB (ΔF) was affected by changes in composition (x), and the BaZnFe12.8(Sn0.5Mn0.5)1.2O23 sample sintered at 1473 K for 10 h in air, exhibited a maximum value of ΔF=2.2 GHz, with a relatively small matching thickness of dm=1.0 mm. When compared with a BaM-type single phase sintered body (BaFe9(Ti0.5Mn0.5)3O19, dm=0.6 mm, ΔF=0.1 GHz), the dm was slightly larger but ΔF became wider. It is concluded that using a two-phase microstructure composed of M and W-type hexaferrite, is an effective method of expanding ΔF.
収録刊行物
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- Materials Transactions, JIM
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Materials Transactions, JIM 41 (5), 567-570, 2000
社団法人 日本金属学会
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詳細情報 詳細情報について
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- CRID
- 1390282679223041152
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- NII論文ID
- 130003557371
- 10005745989
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- NII書誌ID
- AA10699969
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- COI
- 1:CAS:528:DC%2BD3cXkvVOkur8%3D
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- ISSN
- 2432471X
- 09161821
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- NDL書誌ID
- 5384747
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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