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We present the crystal structures and magnetic properties of RE3Sb3Mg2O14(La3Sb3Mg2O14, Pr3Sb3Mg2O14, Sm3Sb3Mg2O14, Eu3Sb3Mg2O14, Tb3Sb3Mg2O14, andHo3Sb3Mg2O14), a family of novel materials based on a perfect geometry 2D rareearth Kagome lattice. Structure refinements were performed by the Rietveldmethod using X-ray diffraction data, indicating that the layered compounds arefully structurally ordered. The compounds crystallize in a rhombohedralsupercell of the cubic pyrochlore structure, in the space group R-3m. Asindicated by magnetic susceptibility measurements, they exhibit predominantlyantiferromagnetic interactions between rare earth moments. Except for possiblyPr3Sb3Mg2O14 and Eu3Sb3Mg2O14, none of the compounds show any signs of magneticordering above 2 K. This RE3Sb3Mg2O14 family of compounds is similar to that ofRE3Sb3Zn2O14, except the series reported here features a fully ordereddistribution of cations in both the nonmagnetic antimony and magnesium sitesand the magnetic rare earth kagome sites. The compounds appear to be relativelydefect-free and are therefore model systems for investigating magneticfrustration on an ideal 2D rare earth Kagome lattice.

Synthesis, crystal structure, and magnetic properties of RE3Sb3Mg2O14 (RE=La, Pr, Sm, Eu, Tb, Ho): new 2D Kagome materials