in neat (no solvent) in a sealed tube at 250°C within 2 h;; small yield;;
参考文献
Atkinson, R. H.; Steigman, J.; Hiskey, C. F.
Analytical Chemistry, 1952 , vol. 24, p. 477 - 488
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Gmelin Handbook: Nb: MVol.B1, 83, page 177 - 180