Compound La[B5O8(OH)2] with a new type of pentaborate layer based on the 5[3T + 2Δ] block: Topology-symmetry analysis and the position in the structural system

Crystals of a new rare-earth borate, LaB5O8(OH)2 (space group P21/n), are synthesized under hydrothermal conditions. The crystal structure is determined by t...