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23 巻, 3 号
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田中 啓文, 弘津 禎彦1999 年 23 巻 3 号 p. 858-862
発行日: 1999年
公開日: 2007/03/20
ジャーナル オープンアクセスThe crystal structure of the α" phase in tempered Fe-N martensite was refined by means of single-crystal electron diffraction intensity analysis. Electron diffraction intensities recorded on imaging plates were compared with the intensities calculated to take account of dynamical. The crystal structure of α" belongs to the space group I4/mmm, and the lattice parameters are a = 0.572 and c = 0.631 nm. The positional parameters x for Fe(8h) and z for Fe(4e) are x = 0.220 and z = 0.303. On the basis of these structural data, electronic band structure calculations using full-potential LAPW method were performed for the Fe16N2. The average magnetic moment per Fe atom is about 2.2 μB, which is nearly equal to that of α-Fe. In high-resolution electron microscope images, α" regions in which the N concentration was less than that of Fe16N2 were observed locally between the Fe16N2 precipitates and the tempered matrix. The magnetic structure of the local non-stoichiometric α" phase is discussed in relation to the band structure.抄録全体を表示PDF形式でダウンロード (350K) -
菅原 英州, 白川 究, 矢野 健, 増本 健1999 年 23 巻 3 号 p. 863-866
発行日: 1999年
公開日: 2007/03/20
ジャーナル オープンアクセスThe purpose of this research is to develop applications of thin-film L-C band-pass filters. We made 3-step L-C band-pass filters that consist of thin-film inductors and thin-film capacitors, determined the L-C constitution and characteristics of the filters, and investigated the Q value of each L and C by simulation. The filters thus produced are small (3.4×2.8×0.6 mm3 = 0.006 cm3), even when the substrate is included, and are applied in the frequency range of about 400 MHz. Their characteristics showed a low insertion loss of -9 dB at 400 MHz, and the wide band characteristics of 75 MHz were obtained for a bandwidth of -3 dB. A Q value of about 20 was obtained for a resonance tank circuit composed of thin-film L-C, and a Q value of 20-50 was obtained for a bridge capacitor containing thin-film capacitors. The values of L, C, and Q for the thin-film inductor, thin-film capacitor, and stray capacitor of the circuit were investigated by simulating the measured results.抄録全体を表示PDF形式でダウンロード (279K) -
平本 雅祥, 松川 望, 榊間 博1999 年 23 巻 3 号 p. 867-870
発行日: 1999年
公開日: 2007/03/20
ジャーナル オープンアクセスThe soft magnetic properties of Fe(Si)/Fe(Si)O multilayered films were investigated. The films were prepared by the pulse-reactive sputtering (PRS) method, which enables multilayered films to be deposited as fast as single films. The soft magnetic properties of the as-prepared films were improved by adding Si. The films show Bs of 1.82-1.87 T and μi' of around 1000 at 300 MHz. A film with Bs of 1.82 T shows μi' of around 1000 at 350 MHz, even after patterning into 18.5 μm-wide stripes.抄録全体を表示PDF形式でダウンロード (310K) -
水嶋 隆夫, 吉田 昌二, 牧野 彰宏, 井上 明久1999 年 23 巻 3 号 p. 871-874
発行日: 1999年
公開日: 2007/03/20
ジャーナル オープンアクセスThe dependence of the core loss for Fe70Al5Ga2P9.65-C5.75B4.6Si3 glassy alloy on the sample thickness and frequency was investigated in a ring-shaped form with the aim of clarifying the application potential. As a result of loss separation, the hysteresis loss of this alloy is not affected by increasing the ribbon thickness to 87 μm. On the other hand, the eddy current loss is affected by increasing the ribbon thickness, and the anomaly factor of this alloy is larger than that of 6.5%Si-Fe alloy for a sample thickness of 50μm. At the same sample thickness, however, the core losses of this alloy are 50-80% smaller than those of 6.5%Si-Fe alloy in the frequency range from 50 Hz to 10 kHz. Comparison of the present data with those for 6.5%Si-Fe alloy indicates that Fe-Al-Ga-P-C-B-Si glassy alloys show promising potential for practical use as core materials.抄録全体を表示PDF形式でダウンロード (261K)
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