  We report the magnetic properties of compounds in the KBaRE(BO3)2 family (RE=
Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb), materials with a planar triangular lattice
composed of rare earth ions. The samples were analyzed by x-ray diffraction and
crystallize in the space group R-3m. Physical property measurements indicate
the compounds display predominantly antiferromagnetic interactions between
spins without any signs of magnetic ordering above 1.8 K. The ideal 2D rare
earth triangular layers in this structure type make it a potential model system
for investigating magnetic frustration in rare-earth-based materials.
