Diffusion and electrotransport of some transition elements in (b.c.c.) thorium

✍ Scribed by I.C.I. Okafor

• Book ID: 102979244
• Publisher: Elsevier Science
• Year: 1987
• Weight: 600 KB
• Volume: 35
• Category: Article
• ISSN: 0001-6160
• DOI: 10.1016/0001-6160(87)90201-x

✦ Synopsis

Diffusion and electrotransport parameters of the transition elements molybdenum, rhenium, tungsten and zirconium in /I thorium were measured, for the temperature rang 1660-1945 K. For each solute element, except zirconium, the measurement was made at four different temperatures, where as for zirconium, studies were performed for only two temperatures 1770 and 1870 K. Our results indicate that all four solute elements migrate to the anode in b.c.c. thorium with mean Z* values of -6.6 for MO, -4.6 for Re, -8.2 for W and about -2.5 for Zr. The results also indicate that molybdenum, rhenium and tungsten diffuse much faster in fi thorium titan zirconium which suggests a correlation between solute atom electric mobility. and diffu~vity with the atomic sizes of both the solute and matrix atom. Results of the diffusion studies yield the following equations of diffusion for Molybdenum: D,, = IS.1 exp(-51,5OO/RT) Renium: D,, = 4.04 x 10-3exp(-20,100/R7') Tungsten: D, = 0.103 exp(-38,lOOIRT) Zirconium: Dz, = 1.70 x 104exp(-91,7OO/RT).