First results of the growing of PbTe single crystals under microgravity conditions |
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Authors: | R Herrmann P Rudolph H Krüger G Schneider R Röstel R Kuhl AS Okhotin VT Khryapov EV Markov IP Kazakov |
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Institution: | Section of Physics, Humboldt-University of Berlin, FRG;Institute of Electronics, Academy of Sciences of the GDR, Berlin, GDR;Space Research Institute, Academy of Sciences of the USSR, Moscow, USSR |
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Abstract: | Two sublimation experiments with PbTe were performed at 850°C and 750°C under microgravity conditions during the “Salyut-6”-“Soyuz-31” mission in 1978. The sublimation took place on the (100)-face of a PbTe crystal. The condensate grown at 850°C shows in the upper part the formation of a pyramidal habit. The bulk consists of parallel growth colums with 100]-boundary faces. The charge carrier concentration of the electrons (N=1,5·1019 cm?3) is higher than the homogeniety limit for 800°C should permit. This is in contrast to the result obtained on the PbTe crystal of the parallel experiment on the earth. At 750°C a laminated condensate is grown with a low growth rate. The microphotograph of the substrate shows the beginning whisker formation according to the VLS-mechanism. |
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