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为了获得高丰度的28S i同位素,生产高纯度的单晶硅,利用气体离心机对硅同位素进行离心分离。通过对S iH-C l3中组成元素的不同同位素丰度的分析,计算了天然S iH-C l3中不同相对分子质量的分子组成。分析结果表明:虽然氯有两种同位素,但也可以将S iHC l3作为分离28S i同位素的工作介质。通过4台离心级联的分离实验,得到了28S i丰度达到99%的S iHC l3样品。离心分离得到的高丰度S iHC l3不用经过化学转化就可以直接用于单晶硅的生产。实验结果表明,采用离心法分离S iHC l3可以得到高丰度28S i。
In order to obtain a high abundance of 28Si isotopes, high purity single crystal silicon is produced and the silicon isotopes are centrifuged using a gas centrifuge. Based on the analysis of different isotopic abundances of the elements in S iH-C l3, the molecular composition of different relative molecular masses in natural S iH-C l3 was calculated. The analysis results show that although chlorine has two kinds of isotopes, it is also possible to use S iHC l3 as a working medium for separating 28S i isotopes. Through 4 centrifuge cascades, S iHC l3 samples with 99% abundance of 28S i were obtained. The high abundance S iHC l3 obtained by centrifugation can be directly used for the production of monocrystalline silicon without chemical conversion. The experimental results show that the high abundance 28S i can be obtained by separating S iHC l3 by centrifugation.