Abstract
Single crystals of compound LiTb6O5(BO3)3 suitable for X-ray diffraction are prepared by the flux growth method. The compound crystallizes in the P21/n space group, a = 8.4350 A, b = 15.6232 A, c = 8.9025 A, β = 92.041°. The obtained compound belongs to the class of 3D-framework oxoborates. It has a similar structure to that of known LiGd6O5(BO3)3 but is not isostructural to the latter. Both structures are derivatives of fluorite, the predecessor compound in this structural series. The cationic part of the predecessor′s structural type is filled by Tb3+ and Li+ cations, while its anionic part is formed by oxide ions and oxygen atoms of borate anions. The melting point (1375±15 °C) and the band gap (4 eV) are determined for LiTb6O5(BO3)3.
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