Influence of gravity-free solidification on solute microsegregation

Yue, Jinmian; Voltmer, F. W.

doi:10.1016/0022-0248(75)90181-5

Cited by 49 publications

(27 citation statements)

References 9 publications

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“…The dewetting phenomenon was observed for the first time in microgravity experiments [1,2] then successfully reproduced in earth experiments [3][4][5][6][7][8][9][10]. The prevailing wisdom for conducting detached growth on earth is to establish a liquid meniscus between the crystal and the crucible wall and maintain it by controlling the pressure difference between the gas space above the melt and the gap.…”

Section: Introductionmentioning

confidence: 91%

On favorable thermal fields for detached Bridgman growth

Stelian

Volz

Derby

2009

Journal of Crystal Growth

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The thermal fields of two Bridgman-like configurations, representative of real systems used in prior experiments for the detached growth of CdTe and Ge crystals, are studied. These detailed heat transfer computations are performed using the CrysMAS code and expand upon our previous analyses [14] that posited a new mechanism involving the thermal field and meniscus position to explain stable conditions for dewetted Bridgman growth. Computational results indicate that heat transfer conditions that led to successful detached growth in both of these systems are in accordance with our prior assertion, namely that the prevention of crystal reattachment to the crucible wall requires the avoidance of any undercooling of the melt meniscus during the growth run. Significantly, relatively simple process modifications that promote favorable thermal conditions for detached growth may overcome detrimental factors associated with meniscus shape and crucible wetting. Thus, these ideas may be important to advance the practice of detached growth for many materials.

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Section: Introductionmentioning

confidence: 91%

On favorable thermal fields for detached Bridgman growth

Stelian

Volz

Derby

2009

Journal of Crystal Growth

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“…Most microgravity data reveal evidence of some convective interference with segregation [4][5][6]8,9]. However, it remains unclear whether (a) convection was driven by minor density differences in the melt (caused by temperature or concentration differences) or (b) convection was driven by surface tension gradients on the free melt surface that may have formed due to de-wetting or bubbles.…”

Section: Introductionmentioning

confidence: 96%

“…In the past 30 years, diffusion controlled segregation has been a key goal in many semiconductor crystal growth experiments conducted in microgravity [3][4][5][6][7][8][9]. However, reproducible data have not been obtained.…”

Section: Introductionmentioning

confidence: 98%

Reproducible Te-doped InSb experiments in Microgravity Science Glovebox at the International Space Station

Ostrogorsky

Marı́n

Churilov

et al. 2008

Journal of Crystal Growth

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“…Obviously, this part of the crystal grew separating from the crucible wall for some reason [1]. Soon afterwards, Witt et al also found the separation growth of crystal when they researched the crystal growth and steady-state segregation of InSb under zero gravity.…”

Section: Introductionmentioning

confidence: 96%

Two-dimensional numerical simulation of thermocapillary convection in detached solidification

Peng

Fan

et al. 2011

Sci. China Technol. Sci.

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Numerical simulations of flow in the melt (CdZnTe) with different conditions are conducted using the finite-difference method. When the top surface of the melt is solid wall under microgravity condition, the thermocapillary convection is caused in the melt by the surface tension gradient on the free surface. As the Marangoni number is small, the flow is steady thermocapillary convection. As the Marangoni number exceeds the critical value, the steady flow transits into unstable thermocapillary convection. When the top surface of the melt is free surface under microgravity, two roll cells are observed in the melt, which are driven by both the surface tension gradients on the upper and lower free surfaces. When the top surface of the melt is free surface under gravity condition, the effect of the buoyancy on the flow is little as the Marangoni number is small. With the Marangoni number increasing, the effect of the buoyancy increases, which makes the upper roll cell weaken and the lower roll cell strengthen. detached solidification, thermocapillary convection, buoyancy, CdZnTe, numerical simulation Citation: Peng L, Fan J Y, Li Y R, et al. Two-dimensional numerical simulation of thermocapillary convection in detached solidification. Sci China Tech Sci, 2012, 55: 527536,

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Influence of gravity-free solidification on solute microsegregation

Cited by 49 publications

References 9 publications

On favorable thermal fields for detached Bridgman growth

On favorable thermal fields for detached Bridgman growth

Reproducible Te-doped InSb experiments in Microgravity Science Glovebox at the International Space Station

Two-dimensional numerical simulation of thermocapillary convection in detached solidification

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