Abstract

AbstractThe New Ternary Boride Mg8Pt4B and the New Intermetallic Compound PtMg2The new magnesium platinum boride Mg8Pt4B was obtained from a reaction of the elements in sealed niobium tubes. It crystallizes isotypically with Mg8Rh4B in the cubic space group $Fd{\bar 3}m$ with a =12.2481(1) Å and can be structurally derived from the Ti2Ni structure type, where boron occupies cavities, which are formed by four magnesium and four platium atoms. The new intermetallic compound PtMg2 was also prepared by reaction of the elements in a sealed Nb container and adopts the tetragonal CuAl2 type structure, space group I4/mcm with a = 6.334(1) Å and c = 5.621(1) Å.

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