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Crystal growth from undercooling melts under strong gradients of temperatures generating in short-duration microgravity

By Mikito Mamiya, Hideaki Nagai, Martin Castillo and Takeshi Okutani


Crystal growth of bulk CdTe in short-duration microgravity is performed by the unidirectional cooling method. The largest growth grains in microgravity samples are 4X2mm. The cooling profiles indicate undercooling melts in microgravity. Cooling melt samples in microgravity generate strong gradient of temperature due to stop thermal convections. Temperature distribution in the melt is calculated by the one-dimensional equation of heat conduction, and about 100 K-undercooling is considered to occur at the cooling surface.\ud \u

Topics: 020199 Astronomical and Space Sciences not elsewhere classified, 030306 Synthesis of Materials, 091205 Functional Materials, Crystal Growth, Short-duration Microgravity, Undirectional
Publisher: Dō Gakkai
Year: 2005
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