Synthesis of rhombohedral borates Ba3R(BO3)3, R = Pr-Dy

Compounds with the composition Ba3R(BO3)3 (R = Pr, Nd, Sm, Eu, Gd, Tb, Dy) were obtained by solid-phase reactions at 1000°C. The compounds were studied by the methods of IR spectroscopy and X-ray and differential thermal analyses. Physicochemical properties of some of them were determined.