Abstract
The concomitant reduction of SnCl2 and NbCl5 with hydrogen has been investigated for the production of NbSn2 upon static Nb substrates and upon fluidized Nb and A12O3 seed particles. The maximum reaction temperature studied was 800 °C since NbSn2 is not stable above 845 °C. NbSn2 has been produced on niobium strip at 700 °C from a vapor phase containing SnCl2 and NbCl5 of ratio 2.6:1. However, the same vapor phase, and ones containing a ratio of up to 5:1, SnCl2 to NbCl5, have been shown to yield only Nb3Sn upon fluidized particles over the temperature range 650 to 750 °C. This observation is explained in terms of an enhanced vapor etching reaction that occurs with Nb seed particles and the inability to nucleate a tin-rich liquid phase, which appears to be necessary for the growth of NbSn2, upon the alumina seed particles.
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