High-pressure synthesis and crystal structure determination of Tb2SiB2O8

Abstract We report the high-pressure/high-temperature synthesis (11 GPa, 1300 °C) of the new compound Tb2SiB2O8. This rare earth borosilicate crystallizes in the orthorhombic space group Pbcn (no. 60) with the unit cell parameters a = 13.2480(3), b = 4.3904(1), and c = 9.1611(3) Å. It is built up of corner-sharing [BO4] tetrahedra forming infinite chains, that are connected to layers via [SiO4] tetrahedra. The layers are connected via [TbO7] polyhedra.