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从1971年开始至今,世界上通过阿波罗、天空试验室等,在失重情况下进行了40余种的材料试验。试验国家主要有美、苏、日、西德等。航天飞机的上天,大大推进了材料试验进程。现在世界各国纷纷租用航天飞机进行失重试验。无重力下的试验到目前为止分别用液相生长法和气相生长法进行了GeTe、InSb、Ge、In_xGa_(1-x)Sb、GeSe_(0.99)Te_(0.01)、GeS_(0.08)Se_(0.02)、GeS、Ga:Ge(Se、Te):Ge、酒石酸钙等晶体生长试验。目的是弄清定向凝固时微观生长情况、掺杂偏析现象、生长速度、融体对流、融体与容器的湿润性等。Witt等人进行的InSb无重力下晶体生长,通过测定迁移率和载流子浓度可知,掺杂分布比在地面上生长的晶体要均匀得多。
Since 1971, more than 40 kinds of material tests have been carried out in the world by using Apollo and Sky Labs under weightlessness. The main test countries are the United States, the Soviet Union, Japan, West Germany and so on. Space shuttle heaven, greatly advancing the material testing process. Now all countries in the world have rented space shuttle for weightlessness test. Experiments without gravitation So far GeTe, InSb, Ge, In_xGa_ (1-x) Sb, GeSe_ (0.99) Te_ (0.01), GeS_ (0.08) Se_ ), GeS, Ga: Ge (Se, Te): Ge, tartrate, and the like. The purpose is to clarify the microscopic growth of directional solidification, doping segregation phenomenon, growth rate, melt convection, melt body and container wettability. Witt et al. Performed InSb crystal growth without gravity, and by measuring the mobility and carrier concentration, we know that the doping profile is much more uniform than the crystals grown on the ground.