Crystal Structure and Magnetic Characteristics of Solid Solutions Mn 1 – x Fe x NiGe

Substitutional solid solutions Mn 1 – x Fe x NiGe (0.05 ≤ x ≤ 1.00) were synthesized. X-ray and neutron diffraction methods were used to study their crystal structure in the temperature range of 20–300 K. A phase transition from the hexagonal structure of the Ni 2 In type into the orthorhombic structure (space group Pnma ) was found at T = 200 K. Magnetic properties of the obtained compounds were also studied in the temperature range of 5–300 K and in external magnetic field up to 10 T. A decrease in the magnetic order–magnetic disorder phase transition point from 272 to 132 K was revealed as the concentration x grows from 5 to 30 mol %.