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Synthesis, crystal structure, and magnetic properties of novel 2D kagome materials RE 3 Sb 3 Mg 2 O 14 (RE = La, Pr, Sm, Eu, Tb, Ho): Comparison to RE 3 Sb 3 Zn 2 O 14 family
Author(s) -
Sanders M. B.,
Baroudi K. M.,
Krizan J. W.,
Mukadam O. A.,
Cava R. J.
Publication year - 2016
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201600256
Subject(s) - crystallography , crystal structure , antimony , supercell , pyrochlore , magnetic susceptibility , rietveld refinement , space group , lattice (music) , materials science , chemistry , x ray crystallography , diffraction , inorganic chemistry , physics , acoustics , optics , phase (matter) , thunderstorm , organic chemistry , meteorology
The crystal structures and magnetic properties of RE 3 Sb 3 Mg 2 O 14 (RE = La, Pr, Sm, Eu, Tb, Ho) with a perfect kagome lattice are presented and compared to RE 3 Sb 3 Zn 2 O 14 . 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 RE 3 Sb 3 Mg 2 O 14 family is similar to that of RE 3 Sb 3 Zn 2 O 14 ; 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 Zn 2+ experiences in RE 3 Sb 3 Zn 2 O 14 , the magnesium sites in RE 3 Sb 3 Mg 2 O 14 are completely ordered. Here we compare the magnetic properties in both series of kagome compounds to determine how significant Zn 2+ '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.