Abstract
New nonstoichiometric SmAl-dimetaborate crystals were synthesized using spontaneous nucleation from Sm2O3 – B2O3 – K2Mo3O10 flux melt. The room temperature and low-temperature single-crystal XRD investigations were carried out. Obtained solids crystallize in the non-centrosymmetric space group P 6¯2 m, with unit cells parameters a=b= 4.570(1) Å, c= 18.521(1) Å, V= 335.00(1) Å3 (for Sm2Al3.84B8O21.27, T = 295°K) and a=b= 4.563(1);Å, c= 18.505(1) Å, V= 333.91(1) Å3 (for Sm2Al3.96B8O21.30, T = 90°K), and z = 1. A comprehensive study of samarium double-cell polytype crystals was performed using scanning electron microscopy, luminescence spectroscopy and Raman measurements.
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