X-ray and Magnetic Studies of the Manganese-Germanium System

Abstract

The constitution of Mn–Ge system within the range of composition 21.8∼35.7 at.% Ge was examined X-ray powder diffraction, and magnetic properties of each phase were studied. The existence of four phases–high- and low-temperature phases at about 22∼23.5 at.% Ge ( ε , ε 1 ), a high temperature phase around 28 at.% Ge (ζ) and a low-temperature phase at 28.6 at.% Ge (κ)–was established. The κ phase is ferrimagnetic below the Curie point 710°K, and the spontaneous magnetization is reversed at 395°K (N type). The other phases exhibit quite anomalous magnetism. The Debye diagram for ζ phase could be indexed assuming a hexagonal structure with lattice parameters a =7.18 6 Å and c =13.0 8 Å.