Uranium-silicon alloys

Structure and phase stability of uranium–silicon U3Si at low temperatures

“…U3Si is formed below 1203 K by a peritectoid reaction (Kaufmann, Cullity & Bitsianes, 1957). Two phases of UaSi are known.…”

Fuel Elements Conference, Paris, November 18-23, 1957

“…The other criterion-lack of evidence for surface area changes-was supported by Alberman and Anderson" and by Aronson et al64 but not by Weissbart et al 66 Alberman and Anderson found no significant changes in surface a r e a upon oxidation. In the work of Aronson et al, surface area measurements on samples oxidized to UOz.…”

“…On the other hand, Weissbart et al 66 present evidence for the immediate formation of a U307 phase on the U02 particle from the appearance of many sharp lines in the x-ray pattern at a composition UOZ.06 for sintered pellets oxidized at 250°C. For powder specimens oxidized at 150 and 200"C, lines of u307 were not observed, however, until the composition UOz.il was reached.…”

Critical evaluation and thermodynamic optimization of the (U + Bi), (U + Si) and (U + Sn) binary systems

“…The e compound forms at 930°C in a peritectic reaction: (bcc (U) + U 5 Si 3 ) ? e. Kaufmann [29] and Kaufmann et al [30] reinvestigated the phase equilibria of the (U + Si) binary system in the whole composition range using thermal analysis, X-ray analysis, and microscopy. Six intermetallic compounds (e, U 5 Si 3 , USi, U 2 Si 3 , USi 2 and USi 3 ) were confirmed by Kaufmann and Kaufmann et al [29,30].…”

“…e. Kaufmann [29] and Kaufmann et al [30] reinvestigated the phase equilibria of the (U + Si) binary system in the whole composition range using thermal analysis, X-ray analysis, and microscopy. Six intermetallic compounds (e, U 5 Si 3 , USi, U 2 Si 3 , USi 2 and USi 3 ) were confirmed by Kaufmann and Kaufmann et al [29,30]. Therein, U 5 Si 3 and USi 2 melt congruently at (1665 and 1700)°C respectively [29,30].…”