The X-ray and bulk densities were determined at room temperature for samples which had been annealed at 900C and quenched into water/ice mixtures. On the basis of these measurements, the vacancy concentrations in the intermetallic phase were deduced. The data could be described quantitatively by using a thermodynamic model which assumed the existence of triple-defects in the lattice. The vacancy data showed that the predominant point defects were not of Schottky type, as previously reported. On the other hand, they were consistent with the triple-defect type which existed in many similar intermetallic phases; such as NiAl.

Vacancy Concentrations in the B2 Intermetallic Phase PdIn at 900C. M.Huang, F.Xie, X.Yan, Y.A.Chang: Intermetallics, 2001, 9[6], 457-60