Pd2Cd11-delta (0.21

The Cd rich part of the Cd-Pd phase diagram was reassessed by means of synthesis and single crystal and powder X-ray diffraction. The region contains two phases that have been reported to have substantial compositional widths, Cd11Pd2 and Cd4Pd. The phase Cd11Pd2 that has previously been reported to be a disordered gamma-brass crystallizing is space group P (4) over bar 3m is here shown to crystallize in I (4) over bar 3m and the mechanism for compositional variation is explained. The phase Pd4Cd has previously been shown to constitute a phase field or a phase bundle of modulated structures and here we determine the structure of a compound Pd0.238Cd0.762 which crystallizes in the orthorhombic superspace group Fmmm(alpha 00)0s0 (F=[(1/2, 1/2, 0, 0); (1/2, 0, 1/2, 0); (0, 1/2, 1/2, 0)] with the fundamental cell dimensions a=4.687(2) angstrom, b=10.000(1) angstrom, c=14.140(2) angstrom, q=0.6432(6)a*. (C) 2013 Elsevier Inc. All rights reserved.