Abstract
Measurements have been made of the lattice spacings of pure ruthenium, and of dilute solid solutions of zirconium, niobium, molybdenum, rhodium, and palladium in ruthenium. In all cases the c lattice spacings and axial ratios of the c.p. hexagonal cell are increased by the formation of a solid solution, and at equiatomic percentages of solute the increases are in the order Rha lattice spacings are diminished by Zr and Rh, and increased by Pd, Nb, and Mo. With Rh as solute, the increase in c and decrease in a counterbalance so that the mean volume per atom is unaltered, whereas Zr decreases, and Nb and Mo increase the mean volume per atom. The theoretical significance of these results is discussed.

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