Texturing of magnetic materials at high temperature by solidification in a magnetic field

Rango, Patricia de; Lees, Martin R.; Léjay, P.; Sulpice, A.; Tournier, R.; Ingold, M.; Germi, P.; Pernet, M.

doi:10.1038/349770a0

Cited by 381 publications

(174 citation statements)

References 8 publications

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“…The texturing during growth difficulty is reduced by using, e.g. a magnetic field [1][2][3][4][5][6]. Two main advantages of the seed method are (i) that large monodomains can be grown up to a few centimeter wide and (ii) the orientation of the sample can be controlled by adjusting the orientation of the seed before the thermal cycle.…”

Section: Introductionmentioning

confidence: 99%

Magneto-transport characterization of Dy123 monodomain superconductors

et al. 2005

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The following report considers textured materials of the DyBa 2 Cu 3 O 7 type seeded with a Nd123 seed as initiator. They are grown with an excess 20% Dy211 phase on a Dy 2 O 3 substrate. We report chemical characterizations, electrical resistivity, thermoelectric power and thermal conductivity over a broad temperature range as a function of an applied magnetic field up to 6 T. We show that specific features appear on the magneto thermal transport properties different in these materials from those found in single crystals and polycrystalline samples. We propose that two vortex regimes can be distinguished in the mixed phase, -due to the intrinsic microstructure. We calculate the viscosity, entropy and figure of merit of the samples.

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Section: Introductionmentioning

confidence: 99%

Magneto-transport characterization of Dy123 monodomain superconductors

et al. 2005

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“…Since the susceptibility parallel to the superconductor grain crystallographic caxis (xc) is higher than the susceptibility perpendicular to the c-axis (xab) [ll-131, nondoped superconductor grains should align with the c-axis parallel to the external field, H. For superconductors doped with magnetic rare-earth elements, the paramagnetic susceptibility is dominated by the R3' ion, and the origin of anisotropy is single-ion anisotropy associated with crystal fields at the rare-earth site [ 141. Grain alignment induced by a magnetic field has been confirmed by various groups [15][16][17][18][19][20][21], although very little work has been done on BSCCO thick films or tapes processed under elevated magnetic fields…”

Section: Dlsclalmermentioning

confidence: 79%

Melt-processing high-T{sub c} superconductors under an elevated magnetic field [Final report no. 2]

Sande¹

2001

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Despite the fact that high critical current densities (JC' s) have been obtained in high temperature conductor (HTS) single crystals, the large-scale application of polycrystalline HTS, such as in wires, solenoids and magnets has been limited by the poor alignment of superconducting grains due to the presence of grain boundary weak links with low values of J, [l].Among the three major families of HTS, namely the Y-Ba-Cu-0 (YBCO), Bi-Sr-Ca-Cu-0 (BSCCO), the T1-Ba-Ca-Cu-0 (TBCCO) systems, the best wires produced so far have been made of BSCCO material [2]. In this system, three superconducting phases are known, in particular Bi-2201 (TC-20K), Bi-2212 (Tc-90K) and BI-2223 (Tc-l 1OK). The crystallographic c-axis perpendicular to the longitudinal plane (Fig. 1). Although significant results in the fabrication of BSCCO thick films and tapes have been obtained [3-51, further improvements are required in order to render these compounds suitable for large-scale applications. Hence, it is important to fully understand the mechanisms that lead to a highly textured microstructure.

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“…In fact, the Al 3 Ni crystals have been evidenced to be oriented in a magnetic field up to 4.4 T with their c-axes parallel to the imposed magnetic field by other researchers using X-ray diffraction techniques. 23,36) In 1991, de Rango et al 37) successfully fabricated oriented YBa 2 Cu 3 O 7 materials at high temperature by solidification in a 5 T magnetic field and proven the possibility for in-situ producing oriented structure during solidification in a high magnetic field. Following their study, the oriented structures were obtained in a series of alloy systems such as Sm-Co, 38,39) Bi-Mn, 40,[41][42][43] Bi-Zn, 44) Al-Fe, 45) Mn-Sb, 46,47) and Al-Ni 23,36,48) alloys and some high-temperature superconductor materials [49][50][51] by solidification in a high magnetic field.…”

Section: Crystal Orientation In Uniform Magnetic Fieldmentioning

confidence: 99%

Solidified Structure Control of Metallic Materials by Static High Magnetic Fields

et al. 2010

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Recently, the studies on the effects of high magnetic fields on solidification processes have been paid much attention both from the fundamental and applied points of view. With the aid of the enhanced Lorentz force and magnetization effect caused by the remarkably increased magnetic field intensity, several interesting phenomena, such as the control of fluid flow and particle migration in a melt, crystal orientation, and phase alignment, have been obtained. Moreover, the magnetic force induced by the interaction of magnetization and high magnetic field gradient has been evidenced to show significant effects on the microstructure evolution of alloys. In this paper, the recent development of the control of the solidification process by high magnetic fields is reviewed from the view point of uniform magnetic fields and magnetic field gradients.

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Texturing of magnetic materials at high temperature by solidification in a magnetic field

Cited by 381 publications

References 8 publications

Magneto-transport characterization of Dy123 monodomain superconductors

Magneto-transport characterization of Dy123 monodomain superconductors

Melt-processing high-T{sub c} superconductors under an elevated magnetic field [Final report no. 2]

Solidified Structure Control of Metallic Materials by Static High Magnetic Fields

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