A previously unreported family of electrically insulating rare-earth borates, RbBaR(BO 3 ) 2 (R = Y, Gd-Yb), was designed and then successfully obtained by traditional solid-state reaction. They crystallize in a monoclinic crystal system space group P2 1 /m (No. 11). They feature triangular planar rare-earth (R) lattices, which are part of, for example, [Yb(BO 3 ) 2 ] 3- infinite 2D layers. These R-based triangular lattices are stacked with layers of crystallographically ordered Rb and Ba atoms to build the 3D structures. Polycrystalline samples of RbBaR(BO 3 ) 2 were used to study the elementary magnetic properties, and millimeter-size RbBaYb(BO 3 ) 2 single crystals were grown by spontaneous nucleation for further anisotropic magnetic characterization. Antiferromagnetic spin interactions are observed for all magnetic compounds, and no long-range magnetic ordering is found down to 1.8 K. Our results suggest that this RbBaR(BO 3 ) 2 (R = Gd-Yb) family may be of further interest both experimentally and theoretically as highly geometrically frustrated magnets.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry