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Germanium-silicon solid solutionsAn experiment on melting and directional crystallization of an antimony (Sb) doped germanium silicon (GeSi) solid solution was designed for the Apollo-Soyuz Test Project (ASTP) to study the possibility of using zero-g conditions for obtaining solid-solution monocrystals with uniformly distributed components. Crystallization in the zero-g environment did not occur under ideal stationary growth and segregation conditions. Crystallization under zero-g conditions revealed the heterogeneous nature of Si and Sb distribution in the cross sections of crystals. The presence of the radial thermal gradient in the multipurpose furnace could be one of the reasons for such Si and Sb distribution. The structure of space-grown crystals correlates with the nature of heterogeneities of Si and Sb distribution in crystals. The type of surface morphology and the contour observed in space-grown crystals were never observed in ground-based crystals and indicate the absence of wetting of the graphitized walls of the ampoule by the melt during melting and crystallization.
Document ID
19770012186
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Zemskov, V. S.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Kubasov, V. N.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Belokurova, I. N.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Titkov, A. N.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Shulpina, I. L.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Safarov, V. I.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Guseva, N. B.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1977
Publication Information
Publication: Apollo-Soyuz Test Project (date]
Subject Category
Astronautics (General)
Accession Number
77N19130
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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