The Al61.49Mn11.35Ni4 phase in the Al–Mn–Ni system

Abstract

An intermetallic phase in the Al–Mn–Ni system crystallizing in space group Cmcm (No. 63) and refined formula Al61.49Mn11.35Ni4 (called the R′ phase) has been synthesized by high-temperature sintering of a mixture with initial chemical composition Al60Mn7Ni3. In comparison with the structure model of the previously reported R phase with composition Al60Mn11Ni4 [Robinson (1954). Acta Cryst. 7, 494–497], there are two mutually exchanged Mn and Ni sites together with one positionally disordered Al site [occupancy ratio 0.811 (8):0.121 (7)] and one partially occupied Mn site [s.o.f. 0.677 (5)] in the current structure model of the R′ phase.