High-pressure Synthesis and Crystal Structure of the Borate Sc3B5O12

Abstract

The rare-earth borate Sc3B5O12 was synthesized under high-pressure / high-temperature conditions of 6 GPa and 1100 °C in a Walker-type multianvil apparatus. The single-crystal structure determination revealed an isotypy to RE3B5O12 (RE = Er-Lu). Sc3B5O12 crystallizes in the rare space group Pmna (Z = 4) with the parameters a = 1245.4(3), b = 443.46(9), c = 1222.1(2) pm, V = 0.675(1) nm3, R1 = 0.0520, and wR2 = 0.0860 (all data). The structure of Sc3B5O12 is composed of layers of condensed BO4 tetrahedra, separated by eight-fold coordinated scandium ions