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High-pressure Crystal Structure of Mn,Sb and Mn2(Fe)Sb CompoundsThe 3-d element pnictides A;B(A=3d-element: B=Sb, As, P) crystallize in one of three structures: the tetragonal Cu;Sb(C38) -type, the hexagonal Fe7P(C22) -type, and the orthorhombic CozP(C23) -type. The rhombohedra1 subcell, common to these three structures, forms a fundamental building block. These structures are built up by three different packings of these building blocks (GOODENOUGH; NYLUND et al.). The similarity of the CuzSb-, Fe2P-, and CozP-type structures favours their mutual transformations into the most advantageous one as to energy on exposure to high pressures and temperatures as well as under atomic substitutions in the lattices of the initial compounds. The Mn,As compound, with Cu..Sb-type structure under normal conditions, transforms into the Fe2Ptype structure under a high pressure of 65kbar at 1373K (JEITSCHKO, JOHNSON). The structure transition Cu:Sb -+ Fe2P is observed in case of chemical compressing of the lattice in the Mnz-,Ni,As (~2 0 . 7 ) system (RYZHKOVSKII et al.) .

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