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Gravitational Effects on Mixing and Growth Morphology of an In 0.5 Ga 0.5 System
Author(s) -
Okitsu Kazuhiko,
Hayakawa Yasuhiro,
Yamaguchi Tomuo,
Kumagawa Masashi,
Hirata Akira,
Fujiwara Syogo,
Okano Yasunori,
Imaishi Nobuyuki,
Yoda Shinichi,
Oida Toshihiko
Publication year - 1996
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170310803
Subject(s) - mixing (physics) , marangoni effect , convection , morphology (biology) , materials science , mixing ratio , temperature gradient , earth (classical element) , mineralogy , analytical chemistry (journal) , chemistry , mechanics , thermodynamics , geology , chromatography , physics , meteorology , quantum mechanics , paleontology , mathematical physics
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.