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Gravitational Effects on Mixing and Growth Morphology of an In0.5Ga0.5 System

Gravitational Effects on Mixing and Growth Morphology of an In0.5Ga0.5 System

Authors :
Akira Hirata
Yasuhiro Hayakawa
Shinichi Yoda
Kazuhiko Okitsu
Tomuo Yamaguchi
Masashi Kumagawa
Yasunori Okano
Toshihiko Oida
Syogo Fujiwara
Nobuyuki Imaishi
Source :
Crystal Research and Technology. 31:969-978
Publication Year :
1996
Publisher :
Wiley, 1996.

Abstract

A mixing experiment of multicomponents melts was performed using a uniform temperature furnace in the Second International Microgravity Laboratories (IML-2) mission. Growth morphologies and Ga concentration profiles were analyzed for the samples with the compositional ratio of 0.5 In–0.5 Ga–1.0 Sb grown under microgravity and on earth. The sample with free surface grown under microgravity was nearly spherical in shape, except some parts with projections. Ga was dispersed homogeneously in the bulk because the mixing was enhanced by Marangoni convection due to the concentration gradient. On the other hand, the sample grown on earth was a double cylindrical shape with different diameters, and Ga concentration decreased from top to bottom, showing clearly the effect of gravity. Many needle crystals were formed in both space and earth samples due to rapid cooling. The average size of the needle crystals grown in space was larger than that of the earth sample.

Details

ISSN :
15214079 and 02321300
Volume :
31
Database :
OpenAIRE
Journal :
Crystal Research and Technology
Accession number :
edsair.doi...........d05edeb297ca7ba7f45d1f6f4cf9143f
Full Text :
https://doi.org/10.1002/crat.2170310803