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R. Herrmann P. Rudolph H. Krüger G. Schneider R. Röstel R. Kuhl A.S. Okhotin V.T. Khryapov E.V. Markov I.P. Kazakov 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1981,1(5):163-166
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. 相似文献
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