open access

https://hdl.handle.net/2115/56856

High-temperature X-ray diffraction measurements of fluorite-related rare earth antimonates Ln(3)SbO(7) (Ln = Nd, Tb) and their magnetic properties

英語

Defect-fluorite

2014-09

Elsevier

Journal of Solid State Chemistry

217

16-21

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; Ccmm for Ln=Sm-Dy), in which Ln(3+) ions occupy two different crystallographic sites (the 8-coordinated and 7-coordinated). For Ln=Nd, two phases with the Cmcm and Cam space groups coexist at room temperature. When the temperature was increased, the Nd3SbO7 compound transformed into a single phase with the space group Cmcm. Through magnetic susceptibility measurements, an antiferromagnetic transition was observed at 3.0 K (Ln=Nd) and 7.8 K (Ln=Tb). Analysis of the magnetic specific heat for Tb3SbO7 indicates that the 8-coordinated Tb ions magnetically orders at 7.8 K, and with furthermore decreasing temperature, the 7-coordinated Tb ions shows antiferromagnetic ordering at 3.0 K.

学術雑誌論文

Accepted Manuscript

(C) 2014 Elsevier Inc. All rights reserved.

0022-4596