Abstract
The compound Fe 3GaAs has been identified as a B8 2-type (hexagonal) phase which exists over a range of compositions represented by the general formula Fe 3Ga 2 − x As x (0.875 ⩽ x ⩽ 1.125). For x ⩽ 0.85 there is a change in structure to another, closely related hexagonal modification which persists to x ≈ 0.21 and in which there is a doubling of the a spacing compared with that of the earlier structure. All the alloys are ferromagnetic ∗ in nature with a marked rise in the Curie temperature with increasing gallium content. Curie temperatures as high as 644 K have been achieved in these alloys. There is a corresponding general increase in the M s values but there is a dip at the composition where there is a change in the structure. Mössbauer measurements on the alloys are in agreement with the magnetic and structural data.
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