1. Synthesis, crystal structure, and magnetic properties of novel 2D kagome materials RE3Sb3Mg2O14 (RE = La, Pr, Sm, Eu, Tb, Ho): Comparison to RE3Sb3Zn2O14 family.
- Author
-
Sanders, M. B., Baroudi, K. M., Krizan, J. W., Mukadam, O. A., and Cava, R. J.
- Subjects
CRYSTAL structure ,MAGNETIC properties ,RIETVELD refinement ,X-ray diffraction ,PYROCHLORE - Abstract
The crystal structures and magnetic properties of RE
3 Sb3 Mg2 O14 (RE = La, Pr, Sm, Eu, Tb, Ho) with a perfect kagome lattice are presented and compared to RE3 Sb3 Zn2 O14 . Rietveld structure refinements were performed using X-ray diffraction data, indicating that the layered compounds are fully structurally ordered. The compounds crystallize in a rhombohedral supercell of the cubic pyrochlore structure, in the space group R-3 m. Magnetic susceptibility measurements show no signs of magnetic ordering above 2 K. The RE3 Sb3 Mg2 O14 family is similar to that of RE3 Sb3 Zn2 O14 ; however, the series reported here features a fully ordered distribution of cations in both the nonmagnetic antimony and magnetic rare earth kagome lattices. Unlike the offsite disorder that Zn2+ experiences in RE3 Sb3 Zn2 O14 , the magnesium sites in RE3 Sb3 Mg2 O14 are completely ordered. Here we compare the magnetic properties in both series of kagome compounds to determine how significant Zn2+ 's positional ordering is within this structure type. The compounds reported here appear to be relatively defect-free and are therefore model systems for investigating magnetic frustration on an ideal 2D rare earth kagome lattice. [ABSTRACT FROM AUTHOR]- Published
- 2016
- Full Text
- View/download PDF