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

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

doi:10.1016/j.jcrysgro.2004.11.222

Cited by 13 publications

(20 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The configuration is similar with that used in the experimental Bridgman set-up equipped www.crt-journal.org with an electromagnetic coil, numerically optimized by Stelian et al [2]. The electrical current intensity supplied in the coil is lower as compared with the mercury experiment.…”

Section: Modeling Of the Electromagnetic Induced Convection In The Gamentioning

confidence: 99%

“…The magnetic field amplitude given from eq. (9) is B 0 = 5mTand corresponds to the optimal value carried out from previous numerical simulations performed for a sample with radius R = 0.6cm [2]. Only the liquid sample is taken into account in the simulation by considering a flat solid-liquid interface.…”

Section: Modeling Of the Electromagnetic Induced Convection In The Gamentioning

confidence: 99%

“…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: 96%

“…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. The optimal magnetic field parameters (frequency f and magnetic induction amplitude B 0 ) for which the electromagnetic convection has a maximum efficiency and the induced heat in the sample is negligible are numerically carried out by Stelian et al [2]. The analysis was performed in the case of a GaInSb sample with the radius R = 0.6cm and the length L = 6cm.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Stelian

Vizman

2006

Cryst. Res. Technol.

View full text Add to dashboard Cite

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.

show abstract

Section: Modeling Of the Electromagnetic Induced Convection In The Gamentioning

confidence: 99%

Section: Modeling Of the Electromagnetic Induced Convection In The Gamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Stelian

Vizman

2006

Cryst. Res. Technol.

View full text Add to dashboard Cite

show abstract

“…5,10) Moreover, the resulting flow field is highly sensitive to variations in coil design, namely the coil configuration 11,12) and the location of the coil with respect to the melt. 13,14) During past decades, investigations by Evans, 15,16) Fautrelle, 17,18) Szekely, 19) and El-Kaddah 10,20) led to a good understanding of the key flow phenomena in EM stirred melts. Their models involved the solution of the Maxwell and turbulent Navier-Stokes equations to describe the electromagnetic and velocity fields in the liquid metal.…”

Section: Introductionmentioning

confidence: 99%

Effect of Coil Design on the Temperature and Velocity Fields during Solidification in Electromagnetic Stirring Processes

Poole

El-Kaddah

2014

ISIJ Int.

View full text Add to dashboard Cite

This paper examines the role of induction coil design on stirring of molten metal in electromagnetic (EM) solidification processes. A model is presented to describe the EM, heat transfer, and fluid flow phenomena in these processes. It is based on a dual-zone description of the mushy region, and accounts for damping of turbulence by the solidified crystallites. The electromagnetic field equations were solved using the mutual inductance technique, while the temperature and turbulent flow fields were calculated using the control volume method. Calculations were performed for solidification of an Al-Cu alloy placed in a stationary magnetic field generated by an induction coil. The effect of coil design on the flow structure was investigated for three different coil positions. It was found that changing the coil position significantly alters the flow pattern from four recirculating loops when the coil is above the midsection of the melt to two loops, typical of a travelling magnetic field, when the coil is at the base of the melt. This significantly modifies the rate of solidification across the ingot, as well as the temperature gradient, in the mushy region. The decay of the velocity and turbulent fields in the mushy region was found to be exponential, with the maximum rate of decay at the solidification front. These results indicate that through changes in coil design, it is possible to control the flow characteristics and solidification behavior in the molten metal.

show abstract

High‐Quality GaSb and GaInSb Crystals Prepared by Vertical Bridgman Method

Wang

Teng

et al. 2017

Crystal Research and Technology

View full text Add to dashboard Cite

High-quality GaSb and Ga 1-x In x Sb (x = 0.14) crystals were grown via the vertical Bridgman (VB) method. The lattice structure, morphology, optical, and transport properties of the GaSb and GaInSb crystals were characterized. The influence of the indium doping on the physical properties of the GaSb crystal was also investigated. The results demonstrate that the indium doping maintains the zinc-blende lattice structure of the GaSb crystal. The segregation of indium is very low, with the radial and axial concentration variation of 2.32% and 4.84%, respectively. The indium doping significantly reduces the dislocation density down to 1.275 × 10 3 cm −2 . The band gap of the indium-doped GaSb is reduced to 0.549 eV, consistent with the decreased infrared transmission measured by FTIR. Surprisingly, the indium doping changes the majority carrier type of the crystal, from p-type in the pristine GaSb crystal to n-type in the GaInSb crystal. Compared to the GaSb crystal, the GaInSb crystal shows enhanced transport properties, with carrier mobility increased to 2.512 × 10 3 cm 2 /(V•s) and resistivity reduced to 0.521 × 10 −3 ohm•cm.

show abstract

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

Cited by 13 publications

References 4 publications

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

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

Effect of Coil Design on the Temperature and Velocity Fields during Solidification in Electromagnetic Stirring Processes

High‐Quality GaSb and GaInSb Crystals Prepared by Vertical Bridgman Method

Contact Info

Product

Resources

About