Synthesis, Crystal Structure, and Compressibilities of Mn(3−x)Ir(5)B(2+x) (0≤x≤0.5) and Mn(2)IrB(2)

The new ternary transition metal borides Mn(3‐x)Ir(5)B(2+x) (0≤x≤0.5) and Mn(2)IrB(2) were synthesized from the elements under high temperature and high‐pressure/high‐temperature conditions. Both phases can be synthesized as powder samples in a radio‐frequency furnace in argon atmosphere. High‐pressure/high‐temperature conditions were used to grow single‐crystals. The phases represent the first ternary compounds within the system Mn–Ir–B. Mn(3−x)Ir(5)B(2+x) (0≤x≤0.5) crystallizes in the Ti(3)Co(5)B(2) structure type (P4/mbm; no. 127) with parameters a=9.332(1), c=2.896(2) Å, and Z=2. Mn(2)IrB(2) crystallizes in the β‐Cr(2)IrB(2) crystal structure type (Cmcm; no. 63) with parameters a=3.135(3), b=9.859(5), c=13.220(3) Å, and Z=8. The compositions of both compounds were confirmed by EDX measurements and the compressibility was determined experimentally for Mn(3−x)Ir(5)B(2+x) and by DFT calculations for Mn(2)IrB(2).