The effect of lattice distortions on the X-ray measurement of lattice parameters for PdHx. I. Empirical relationships

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Abstract
Measurements have been made of the changes in X-ray lattice parameter which result when a PdHx alloy is taken on a path in the PdHx phase diagram which traverses the mixed ( alpha + beta )-phase region to reach beta -phase concentrations (0.70<x<0.92). The changes were followed by comparing the lattice parameter values for alloys which had been taken along such a path with lattice parameter values of alloys taken along paths avoiding the mixed-phase region in reaching beta -phase concentrations of comparable value. From previous experience with the mixed ( alpha + beta )-phase region and the observed diffraction line broadening and magnitude and direction of the lattice parameter shifts, it can be inferred that the lattice parameter changes are due to internal stresses resulting from the progression of the alpha to beta phase change as the alloy is moved through the mixed-phase region. A discussion is given of some implications of the observations for the use of lattice parameter measurements in locating coexistence curves for M-H alloys.