Effect of residual accelerations during microgravity directional solidification of mercury cadmium telluride on the USMP-2 mission

Gillies, Donald C.; Lehoczky, S. L.; Szofran, F. R.; Watring, Dale A.; Alexander, Helga A.; Jerman, G. A.

doi:10.1016/s0022-0248(97)01085-3

Cited by 19 publications

(10 citation statements)

References 5 publications

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“…Since the diffusion coefficients of dopants are not known precisely, the length of the initial transient cannot be evaluated exactly. Diffusion-controlled steady state followed by a final transient, as predicted by Tiller et al [10], has been reported only in II-VI systems [8] having equilibrium segregation coefficients k41. However, the relatively long final transient [8] suggests convective interference with segregation.…”

Section: Introductionmentioning

confidence: 91%

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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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Section: Introductionmentioning

confidence: 91%

“…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: 99%

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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“…Variation of residual gravity direction at a level as low as 10 À6 g by various orientations of a space craft in orbit induce up to 10 À1 scale variations of stoichiometry in e.g. CdHgTe crystals (Gillies et al, 1997). Vibrations on the space craft, particularly manned ones, also induce crystal inhomogeneities.…”

Section: Origin Of Defectsmentioning

confidence: 99%

Crystal Growth and Crystallography

Chernov¹

1998

Acta Cryst Sect A

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Selected topics that may be of interest for both crystalstructure and crystal-growth communities are overviewed. The growth of protein crystals, along with that of some other compounds, is one of the topics, and recent insights into related phenomena are considered as examples of applications of general principles. The relationship between crystal growth shape and structure is reviewed and an attempt to introduce semiquantitative characterization of binding for proteins is made. The concept of kinks for complex structures is brie¯y discussed. Even at suf®ciently low supersaturations, thē uctuation of steps may not be suf®cient to implement the Gibbs±Thomson law if the kink density is low enough. Subsurface ordering of liquids and growth of rough interfaces from melts is discussed. Crystals growing in microgravity from solution should be more perfect if they preferentially trap stress-inducing impurities, thus creating an impurity-depleted zone around themselves. Evidently, such a zone is developed only around the crystals growing in the absence of convection. Under terrestrial conditions, the self-puri®ed depleted zone is destroyed by convection, the crystal traps more impurity and grows stressed. The stress relief causes mosaicity. In systems containing stress-inducing but poorly trapped impurities, the crystals grown in the absence of convection should be worse than those of their terrestrial counterparts.

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“…Gillies et al [10] investigated growth of HgTe-CdTe having k=3.9. To avoid interface breakdown due to constitutional supercooling, the growth rate was 0.2 lan / s (0.72 mm/hr).…”

Section: Introductionmentioning

confidence: 99%

“…Indium Antimonide was chosen because of its low melting point (525 °C), which made the experiments suitable for the Microgravity Science Glovebox (MSG) facility at the ISS. The four Te-doped InSb crystals had a nearly identical diffusion controlled initial transient [ 10]. The equilibrium segregation coefficient of Te in InSb is k=0.5.…”

Section: Introductionmentioning

confidence: 99%

Initial transient in Zn-doped InSb grown in microgravity

Ostrogorsky

Marı́n

Volz

et al. 2009

Journal of Crystal Growth

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Three Zn-doped InSb crystals were directionally solidified under microgravity conditions at the International Space Station (ISS) Alpha. The distribution of the Zn was measured using SIMS. A short diffusion-controlled transient, typical for systems with k>1 was demonstrated.Static pressure of -4000 N/m 2 was imposed on the melt, to prevent bubble formation and dewetting. Still, partial de-wetting has occurred in one experiment, and apparently has disturbed the diffusive transport of Zn in the melt.

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Effect of residual accelerations during microgravity directional solidification of mercury cadmium telluride on the USMP-2 mission

Cited by 19 publications

References 5 publications

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

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

Crystal Growth and Crystallography

Initial transient in Zn-doped InSb grown in microgravity

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