The effect of the impurities on the magnetic, electronic and optical properties of Mn5Ge3

Identification of Ge═O Double Bonds in Planar MnGe3O and MnGe4O Clusters: Anion Photoelectron Spectroscopy and Ab Initio Calculations

“…14 Theoretical studies showed that the number of oxygen atoms would affect the total magnetization of Mn 5 Ge 3 . 15 Investigating the structures and bonding properties of Mndoped germanium oxide clusters may provide useful information for the applications of manganese germanium oxides. In addition, the study on the Mn-doped germanium oxide clusters would facilitate the exploration of some unusual chemical bonds such as Ge�O double bonds, which are very rare in common stable compounds.…”

“…In the last decades, some experimental and theoretical studies have been conducted to investigate the effects of oxygen on the electronic and magnetic properties of Mn-doped germanium materials. − The experimental studies showed that oxygen has no significant effect on the high Curie temperature ferromagnetic ordering of Mn x Ge 1– x nanowires . The theoretical studies suggested that the heat of formation of Mn impurities in Ge was lowered due to the presence of oxygen; however, the magnetic moments of Mn were preserved when the oxygen concentration was low .…”

“…Matsynin et al found that introducing oxygen can increase the Curie temperature and saturation magnetization of Mn 5 Ge 3 -based nanocomposite materials . Theoretical studies showed that the number of oxygen atoms would affect the total magnetization of Mn 5 Ge 3 …”

Magnetocaloric effect and critical behavior of the Mn5Ge3−xZnx alloys

“…As a typical intermetallic system with second-order phase transition, Mn 5 Ge 3 has excellent magnetic and magnetocaloric properties and is considered as an excellent material of room-temperature magnetic refrigeration. Previous studies on Mn 5 Ge 3 in hexagonal D8 8 structure system confirmed that the alloy has a Curie temperature of about 297 K, a magnetic moment of 2.5 μ B /Mn and a relative cooling power (RCP) up to 376 J kg −1 [16][17][18][19][20]. After years of development, the structure and magnetocaloric properties of Mn 5 Ge 3 -based alloys have been investigated intensively, and some interesting results have been achieved.…”