An X-Ray Diffraction Study of the Silver-Magnesium Alloy System

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Abstract
Four homogeneous solid solutions were found in the silver‐magnesium alloy system. The α‐primary solid solution of magnesium in silver has a f.c.c. structure. The β‐solid solution has a b.c.c. structure. The γ‐solid solution appears to have a complicated structure. While others have identified it as hexagonal, no definite structure could be assigned to it from our diffraction data. The δ‐solid solution has a h.c.p. structure of magnesium. The lattic parameter a0 in the α‐solid solution increases with increasing magnesium concentration but exhibits a marked negative deviation from Vegard's Law. The a0 in the β‐solid solution, however, increases linearly with increasing magnesium concentration. Silver and magnesium atoms are distributed at random in the α‐phase but take up preferred positions in the β‐phase. The ordering process takes place throughout the β‐phase, but is most nearly complete in the region of 50 atomic percent Mg.

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