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我们在进行变价稀土的研究中经常要合成SmI_2,利用金属钐和碘化汞在高温高真空条件下使其固相合成。在该过程中三碘化钐是个中间过渡状态,最终转化为SmI_2,这样合成的SmI_2中是否含有SmI_3?钐的价态测试,因而是一个重要环节。我们曾用X-射线分析法进行分析。该法精确度不高,若SmI_3的含量在1％以下时,就测不出它的准确含量。用重量法分析时,是以SmI_2 的含量为100％为前题的。若含有SmI_3时则不能进行分析。用差热分析测
We are often in the study of rare earth elemental synthesis of SmI_2, the use of metal samarium and mercuric iodide in high temperature and high vacuum to make it solid phase synthesis. During this process, samarium triiodide is an intermediate transitional state and eventually transformed into SmI_2. Therefore, the synthesis of SmI 2 is an important step for the valence state test of SmI 3 Sm. We used to analyze X-ray analysis. The accuracy of the method is not high, if the content of SmI_3 is below 1%, it can not measure its exact content. Gravimetric analysis, based on the content of SmI_2 100% for the former title. If SmI_3 is included, it can not be analyzed. Measured with differential thermal analysis