Abstract
The phases SrAu and BaAu were synthesized and characterized structurally. SrAu, mP40, space group P/2 1 m, a = 40.13(2), b = 4.697(1), c = 6.192(4)A˚, β = 94.21(6)°, Z = 20, is a new stacking variant of the FeB CrB type, with Jagodzinski notation hch 2 ch 2 chc. The structure was refined from single crystal diffractometric data with R = 0.090. BaAu, oP8, space group Pnma, a = 8.338(5), b = 4.925(1), c = 6.390(4)A˚, Z = 4, crystallizes in the FeB structure type. A general correlation among the AB equiatomic phases formed by the alkaline earths with VIII to IVB group elements is found by reporting the B B chain angle against the combination R AB σ = |( r A s + r A p) − ( r B s + r B p)| with Zunger's r orbital radii.
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