Abstract
The long-range order in a b.c.c. iron-gallium solid solution is studied by X-ray diffraction for concentrations ranging from 15 to 30 at.% Ga. No ordering is detected below 22 at.% Ga. The temperature of the DO 3 /a3 A2 transition is determined using both X-ray diffraction and differential thermal analysis. At concentrations greater than 28 at.% Ga. the phase having a B2 structure is stable at high temperatures. The study of the formation of S I and S II as a function of the state of precipitation for different isothermal temperatures allows a precise determination of the regions of the phase diagram where the DO 3 structure is stable or metastable. The ordering energies are evaluated for nearest neighbours ( V 1 = 1.13 kcal/mol) and for second nearest neighbours ( V 2 = 0.685 kcal/mol) using the Bragg and Williams model.
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