AbstractThe isotypic triel borates Al5B12O25(OH) and Ga4InB12O25(OH) were synthesized in a Walker-type multianvil apparatus under high-pressure/high-temperature conditions of 12.0 GPa/1400 °C and 12.3 GPa/1200 °C, respectively. The crystal structures of both compounds, determined by single-crystal X-ray diffraction, constitute new representatives of the structure type M5B12O25(OH) (M = Ga, In) crystallizing in the space group I41/acd. The presence of the hydroxyl groups was confirmed via single-crystal IR spectroscopy.
Orthorhombic HP-Al2B3O7(OH) was synthesized in a Walker-type multianvil apparatus under high-pressure/high-temperature conditions of 12.4 GPa and 1200 °C, respectively. Its structure is isotypic to that of Ga2B3O7(OH) and has been determined via single-crystal X-ray diffraction at room temperature. HP-Al2B3O7(OH) crystallizes in the space group Cmce (Z = 8) with the lattice parameters a = 10.3124(4), b = 7.3313(3), c = 10.4801(5) Å, and V = 792.33(6) Å3. The compound has also been characterized by IR and Raman spectroscopy.
The isotypic trielborates c-Al 5 B 12 O 25 (OH), c-Al 1.7 Ga 3.3 B 12 O 25 (OH), and c-Ga 4 InB 12 O 25 (OH) were synthesized under high-pressure/ high-temperature conditions of � 12 GPa and � 1100°C. The three cubic compounds crystallize in the space group Fm � 3m with Z = 4 and a = 10.8226(5), 10.9258(5), and 11.176(2) Å for c-Al 5 B 12 O 25 (OH), c-Al 1.7 Ga 3.3 B 12 O 25 (OH), and c-Ga 4 InB 12 O 25 (OH), respectively. The crystal structures of all three compounds were determined by single-crystal X-ray diffraction revealing disordered cubic structures composed of MO 6 octahedra (M = Al, Al/ Ga, Ga, In) and BO 4 tetrahedra. Single-crystal Raman and IR spectroscopic data further characterize the compounds, and the latter confirms the presence of hydroxyl groups.
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