New ferromagnetic 5 : 4 compounds in the rare earth silicon and germanium systems

Phase relationships and structural, magnetic, and thermodynamic properties of alloys in the pseudobinaryEr5Si4−Er5Ge4Pecharsky1, Gschneidner2, Pecharsky3 et al. 2004Phys. Rev. B503301View full textAdd to dashboardCite

“…The Curie-Weiss parameters of these three alloys are found in Table II. For Er 5 Ge 4 , they are in fair agreement with those reported by Holtzberg et al 2 The low temperature heat capacity of Er 5 Ge 4 is shown in Fig. 14.…”

“…Conversely, the germanides were reported to order antiferromagnetically at 15 and 47 K for Gd 5 Ge 4 (recent data, [3][4][5][6][7][8][9] however, indicate that Néel temperature of Gd 5 Ge 4 is ϳ128 K), 30 K for Tb 5 Ge 4 , 40 K for Dy 5 Ge 4 , 21 K for Ho 5 Ge 4 , and 7 K for Er 5 Ge 4 . In the Gd 5 Si x Ge 4−x system, Holtzberg et al 2 also found two extended solid solutions based on both Gd 5 Si 4 and Gd 5 Ge 4 , and a new ternary phase with an unknown crystal structure.…”

“…Both the existence and crystallographic data of binary rare earth-germanium and rare earth-silicon compounds with the R 5 T 4 stoichiometries (R = rare earth element, T = Si or Ge) were originally reported by Smith et al 1 Soon after, Holtzberg et al 2 described phase relationships in the pseudobinary Gd 5 Si 4 -Gd 5 Ge 4 system. They 2 also confirmed the crystallography and provided magnetic property data for the binary R 5 T 4 silicides and germanides of heavy lanthanides, i.e., for R = Gd, Tb, Dy, Ho, and Er.…”

The fruition of 4f discovery, the interplay of basic and applied research

“…Research in the late-1960's by Holtzberg et al [12] reported that the substitution of Ge for Si would lower the Tc of Gd&, but at about a 50% replacement of the Si atoms, a new crystal structure was formed, and that at even higher Ge contents the magnetic structure changed from ferromagnetic (at Gd&) to antiferromagnetic (at GdsGe4). Since more detailed information would be needed for the utilization of GdsSi4-based materials in magnetic refrigerators, we began a thorough crystaliographic, magnetic and thermal study of the Gds(Si,Gel,)4 pseudo-binary system.…”

Thermal expansion studies on the unusual first order transition of Gd5Si2.09Ge1.91: effects of purity of Gd

“…1 In recent years, this material has attracted much attention due to its unusual giant magnetocaloric effect ͑MCE͒, 2 giant magnetoresistance ͑GMR͒, and colossal magnetostriction ͑CMS͒. 3 It is very unusual for a single material to possess these three effects together.…”