Ternary rare earth antimonates Ln 3 SbO 7 (Ln = rare earths) were prepared and their structures were determined by x-ray diffraction measurements. They crystallize in an orthorhombic superstructure of cubic fluorite (space group Cmcm for Ln = La, Pr, Nd; C222 1 for Ln = Nd ~ Lu), in which Ln 3+ ions occupy two different crystallographic sites (the 8-coordinated and 7-coordinated sites). Their magnetic properties were characterized by magnetic susceptibility and specific heat measurements from 1.8 to 400 K. The Ln 3 SbO 7 (Ln = Nd, Gd -Ho) compounds show an antiferromagnetic transition at 2.2 ~ 3.2 K. Sm 3 SbO 7 and Eu 3 SbO 7 show van Vleck paramagnetism. Measurements of the specific heat down to 0.4 K for Gd 3 SbO 7 and the analysis of the magnetic specific heat indicate that the antiferromagnetic ordering of the 8-coordinated Gd ions occur at 2.6 K, and the 7-coordinated Gd ions order at a furthermore low temperature.3
Magnetic properties D 9000Magnetic Properties of Orthorhombic Fluorite-Telated Oxides Ln3SbO7 (Ln: Rare Earths). -The title compounds (Ln: La-Lu) are prepared by reaction of Ln 2 O 3 , (or Pr6O11, Tb4O7) and Sb2O3 in concentrated HNO3 (1200°C, 12 h) and characterized by powder XRD, magnetic susceptibility, and specific heat measurements from 1.8 to 400 K. They crystallize in an orthorhombic superstructure of the cubic fluorite type in the space group Cmcm (Ln: La, Pr, Nd) or C2221 (Ln: Nd-Lu). The compounds with Ln: Nd, Gd-Ho show an antiferromagnetic transition at 2.2-3.2 K. Sm 3 SbO 7 and Eu3SbO7 exhibit van Vleck paramagnetism. The 8-coordinated Gd ions in Gd3SbO7 order antiferromagnetically at 2.6 K. With decreasing temperature, the 7-coordinated Gd ions show a magnetic anomaly, namely the magnetic moments at the two crystallographic sites order individually. -(HINATSU*, Y.; EBISAWA, H.; DOI, Y.; J. Solid
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