J. Cueilleron, J. Viala
Jun 1, 1979
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0
Influential Citations
2
Citations
Journal
Journal of The Less Common Metals
Abstract
Abstract The synthesis, purification and thermal decomposition of boron triiodide have been investigated as a method for preparing high purity boron. Using spark source mass spectrography for the analyses of bulk samples, the purity of boron is studied as a function of the purification treatments applied to BI3 prior to its decomposition. Bisublimation, recrystallization and, to a higher degree, zone refining of BI3, result in a noticeable decrease in the levels of almost all impurities except carbon and oxygen. The lowest contamination levels attained are 200 and 470 wt. ppm for carbon and oxygen, respectively and a total content of 150 wt. ppm for the other main impurities. Whereas the latter value could be reduced by improved zone refining of BI3, lower levels of carbon and oxygen appear very difficult to obtain.