Abstract
The rubidium triborate HP-RbB3O5 (HP=high-pressure) was synthesized under highpressure =high-temperature conditions of 6 GPa and 1000° C in a Walker-type multianvil apparatus. The precursor was gained from a mixture of rubidium carbonate Rb2CO3 and boric acid H3BO3 heated at 850 °C under normal pressure conditions. The single-crystal structure determination showed that HP-RbB3O5 is isotypic to HP-KB3O5, crystallizing monoclinically with eight formula units in the space group C2/c possessing the lattice parameters a=982.3(2), b=885.9(2), c=919.9(2) pm, and β = 104:0(1)°. The boron-oxygen framework consists of trigonal-planar BO3 groups as well as corner- and edge-sharing BO4 tetrahedra that are connected to a three-dimensional framework. Therein, the rubidium cations are surrounded by 10 oxygen anions. IR- and Raman-spectroscopic investigations were performed on single crystals of the compound.
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