Solute segregation in directional solidification of GaInSb concentrated alloys under alternating magnetic fields

Stelian, Carmen; Delannoy, Yves; Fautrelle, Yves; Duffar, T.

doi:10.1016/j.jcrysgro.2004.02.047

Cited by 39 publications

(36 citation statements)

References 5 publications

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“…[5], in order to increase the level of the convection and to mix the solute near the interface. The magnetic field parameters (magnitude and frequency) were computed by using numerical modeling, in order to obtain a good electromagnetic mixing of the solute at the interface, with a minimum of heat released in the melt.…”

Section: Introductionmentioning

confidence: 99%

Bridgman growth of concentrated GaInSb alloys with improved compositional uniformity under alternating magnetic fields

Stelian

Delannoy²,

Fautrelle³

et al. 2005

Journal of Crystal Growth

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Section: Introductionmentioning

confidence: 99%

Bridgman growth of concentrated GaInSb alloys with improved compositional uniformity under alternating magnetic fields

Stelian

Delannoy²,

Fautrelle³

et al. 2005

Journal of Crystal Growth

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“…This leads to a huge increase of the radial variation of indium concentration and of the interface curvature. The quality of highly doped crystals can be improved by applying an alternating magnetic field produced by a coil placed around the crucible in the vicinity of the interface, as is shown by previous numerical simulations [1,2]. In this case the level of the convection is increased in order to obtain a strong mixing of the solute near the solid-liquid interface and to improve the chemical homogeneity of the sample.…”

Section: Introductionmentioning

confidence: 94%

“…The use of alternating magnetic fields for the stirring of GaInSb high doped alloys (10% -20% indium concentration) grown in a vertical Bridgman configuration, has been proposed by Stelian et al [1]. Numerical simulation of thermo-solutal convection in GaInSb melts, shows a strong solutal damping effect of the flow near the solid-liquid interface in the case of concentrated alloys.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of frequency influence on the electromagnetic stirring of semiconductor melts

Stelian

Vizman

2006

Cryst. Res. Technol.

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Alternating magnetic fields can be used in order to increase the level of convection and to mix the doped semiconductor alloys. A numerical analysis of the electromagnetic induced convection in GaInSb semiconductor melts is performed by using the software package CrysVUn. The magnetic field parameters are varied in order to obtain a maximum efficiency of the induced convection with a minimum quantity of the heat released in the melt. The influence of the electrical current frequency on the convection intensity is analyzed for samples with various radii (R = 0.5 -3cm). Numerical procedure is validated by comparing the numerical results obtained in mercury samples with the experimental data given from the literature, which show a maximum stirring for a magnetic skin depth δ = 0.2R, in the case of a mercury sample with the radius R = 10 cm. This maximum corresponds to a shielding parameter R ω = 40. Our numerical results show that the value of the shielding parameter for which the convection intensity reaches the maximum depends on the sample radius and increases when the sample radius increases. The results of this analysis are important in the case of samples with small radius, when a good mixing of the melt can be obtained for frequencies much lower than those corresponding to a shielding parameter R ω = 40.

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“…Moreover, it is the theoretical foundation of analyzing the segregation in solidification process [12][13][14]. Liquid phase separation induces the macroscopic solute redistribution, while rapid solidification greatly influences the microscopic solute distribution in solidified phases.…”

Section: Introductionmentioning

confidence: 99%

Solute redistribution during phase separation of ternary Fe–Cu–Si alloy

et al. 2015

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Ternary Fe 48 Cu 48 Si 4 immiscible alloy was rapidly solidified under the containerless microgravity condition inside a drop tube. Liquid phase separation took place in the alloy melt and led to the formation of various segregated structures. The core-shell structure consisting of Fe-rich and Cu-rich zones and the homogenously dispersed structure were the major structural morphologies. Phase field simulation results revealed that the two-layer core-shell was the final structure of liquid phase separation. The solute redistribution of liquid Fe 48 Cu 48 Si 4 alloy experienced the macroscopic solute distribution induced by liquid phase separation, the secondary phase separation within the separated liquid phases and the solute trapping during rapid solidification. Energy dispersive spectroscopy analysis showed that the solute Si was enriched in the Ferich zone whereas depleted in the Cu-rich zone. In addition, both aFe and (Cu) phases in the Fe-rich zone exhibited a conspicuous solute trapping effect. As compared with (Cu) phase, aFe phase had a stronger affinity with solute Si.

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Solute segregation in directional solidification of GaInSb concentrated alloys under alternating magnetic fields

Cited by 39 publications

References 5 publications

Bridgman growth of concentrated GaInSb alloys with improved compositional uniformity under alternating magnetic fields

Bridgman growth of concentrated GaInSb alloys with improved compositional uniformity under alternating magnetic fields

Numerical modeling of frequency influence on the electromagnetic stirring of semiconductor melts

Solute redistribution during phase separation of ternary Fe–Cu–Si alloy

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