Measurements of the extended X-ray absorption fine structure (EXAFS) were used to determine the local configuration around uranium and zirconium atoms in (U,Zr)Pd-3 solid solutions. Interatomic distances and lattice constants from EXAFS and X-ray diffraction, respectively, are discussed in relation to the effect of addition of ZrPd3 to UPd3. The decrease in U-Pd distance with ZrPd3 addition was appreciably smaller than the average M-Pd (M = U, Zr) distance of the solutions. The result suggests that the 5-f localized electronic structure of UPd3 resists compression by the addition of ZrPd3. (C) 1998 Elsevier Science S.A.
The palladium-zirconium phase diagram has been re-investigated over its entire composition range. The revised diagram includes two intermediate phases, Pd4Zr3 and Pd11Zr9, which did not appear in previous studies. The crystal structures of the new phases resemble the B2-type structure although the atoms are displaced significantly from the cubic lattice sites. The present observations are discussed and compared with similar results from the related systems Ni-Ti and Rh-Zr. Published by Elsevier Science S.A.