Control of Crystal Orientation in Deposited Films of Bismuth Vaporized in Laser and Resistance Heating Methods under a High Magnetic Field

Tahashi, Masahiro; Ishihara, M.; Sassa, Kensuke; Asai, Shigeo

doi:10.2320/matertrans.44.285

Cited by 43 publications

(23 citation statements)

References 11 publications

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“…The experimental results were given in the followings: The relative facial angle defined elsewhere, 27) which indicates a lumped crystalline angle obtained by using X-ray diffraction analysis pattern, is shown in Fig. 4.…”

Section: Sintering Processmentioning

confidence: 99%

Magnetic Crystalline Alignment

Asai

2007

ISIJ Int.

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Section: Sintering Processmentioning

confidence: 99%

Magnetic Crystalline Alignment

Asai

2007

ISIJ Int.

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“…On the other hand, it is possible to control crystal orientation of non-magnetic materials such as metals, 4,5) ceramics 6,7) and polymers 8) by imposition of a high magnetic field if these materials have magnetic anisotropy. In the case of HAp, the a,b-plane orientates perpendicular to the direction of a magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Orientation of Hydroxyapatite <I>C</I>-Axis under High Magnetic Field with Mold Rotation and Subsequent Sintering Process

et al. 2005

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Orientation of hydroxyapatite (HAp) crystals is one of the promising ways to utilize their anisotropic nature of chemical and biological properties. On the other hand, the development of super conducting magnet technology enables to introduce a high magnetic field which can control crystal orientation of non-magnetic materials with magnetic anisotropy. In this study, a horizontal 10 T static magnetic field was imposed on slurry containing HAp crystals under the horizontal mold rotation during slip casting process so as to introduce c-axis orientation for some amount of crystals in the sample, and then it was sintered in atmosphere without the magnetic field. From SEM observation and X-ray diffraction, it has been found that the c-axis of pillar shape HAp crystals in the sample treated with the magnetic field and the mold rotation were oriented to a particular direction and it was enhanced by the subsequent sintering process, while the c-axis crystal orientation of the sample treated without the magnetic field and with the mold rotation was not observed before and after the sintering.

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“…In particular, crystal alignment is an attractive tool for producing functional materials, because physical properties of materials, such as the electric, magnetic, thermal, and mechanical properties, can be controlled if these properties have an anisotropic nature. With the development of the technology of superconducting magnets, crystals of nonmagnetic, magnetically anisotropic materials such as metals, [4][5][6] ceramics, 7,8) and polymers 9) can be aligned by the imposition of a strong magnetic field. To form unidirectionally aligned crystals for a material with a magnetic anisotropy of c < a , a combined process involving the imposition of a magnetic field and the rotation of a sample has been proposed.…”

Section: Introductionmentioning

confidence: 99%

<I>In-Situ</I> Observation of Crystal Alignment under a Magnetic Field Using X-ray Diffraction

et al. 2007

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The crystal alignment behavior of bismuth particles in the presence of an imposed static magnetic field was examined in situ by X-ray diffraction. Because the c-plane of a bismuth crystal is aligned perpendicular to the direction of a magnetic field, the temporal variation in the (110) peak intensity of bismuth was measured by X-ray diffraction to determine the crystal alignment. The alignment time decreased as the magnetic field strength increased. This tendency is similar to that calculated for the relaxation time. The difference in the magnetic susceptibility between the magnetically easy and hard axes is the driving force for the crystal alignment, and aggregation of the bismuth particles decreases this driving force. The effective difference in magnetic susceptibility for aggregated bismuth particles was estimated by measuring the alignment time of the particles under magnetic fields of various strengths. The estimated effective difference in magnetic susceptibility generally increases with a decreasing magnetic field strength. Furthermore, the interference to crystal rotation caused by the interaction between the induced current and the imposed magnetic field is negligible in this study. To decrease the strength of the magnetic field required for alignment of crystals, the number of small particles should be reduced.

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Control of Crystal Orientation in Deposited Films of Bismuth Vaporized in Laser and Resistance Heating Methods under a High Magnetic Field

Cited by 43 publications

References 11 publications

Magnetic Crystalline Alignment

Magnetic Crystalline Alignment

Orientation of Hydroxyapatite <I>C</I>-Axis under High Magnetic Field with Mold Rotation and Subsequent Sintering Process

<I>In-Situ</I> Observation of Crystal Alignment under a Magnetic Field Using X-ray Diffraction

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