Flux Growth and Crystal Structure Refinement of Calcite Type Borate GaBO3
نویسندگان
چکیده
A single crystal of gallium borate, GaBO3, 4 × 4 × 0.2 mm3 in size has been grown by spontaneous crystallization with a molten flux based on a Bi2O3-3B2O3 solvent. From single crystal X-ray diffraction measurement, GaBO3 was found to crystallize in the trigonal calcite type, space group R-3c, with cell dimensions a = 4.56590(10) and c = 14.1764(4) Å, Z = 6. Layers of distorted [GaO6] octahedra are interleaved by layers of triangular planar [BO3] unites. The transmission spectrum on a single crystal indicated that the band gap of GaBO3 is 3.62 eV.
منابع مشابه
Multianvil High-Pressure Synthesis and Crystal Structure of /3-YbBC>3
Z. Naturforsch. 56 b, 697-703 (2001); received April 5, 2001 Multianvil, High-Pressure Synthesis, Borates /3-Ytterbium borate (ö-YbBOi) was synthesized under high-pressure in a Walker-type mul tianvil apparatus at 2.2 GPa and 1400 °C. The title-compound crystallizes in the trigonal calcite structure, space group R3c. Single crystal X-ray data yielded a = 492.1(2), c = 1630.5(9) pm, wR2 = 0.034...
متن کاملDineodymium(III) ditungstate(VI), Nd2W2O9
Single crystals of monoclinic Nd(2)W(2)O(9) were obtained by growth from tungsten borate flux in an atmosphere of air. The crystal structure consists of chains of distorted [WO(6)] octa-hedra that run along the c axis of the structure, and of [NdO(9)] polyhedra that are connected via common faces and common edges to form a three-dimensional framework.
متن کاملRe-evaluating boron speciation in biogenic calcite and aragonite using 11B MAS NMR
Understanding the partitioning of aqueous boron species into marine carbonates is critical for constraining the boron isotope system for use as a marine pH proxy. Previous studies have assumed that boron was incorporated into carbonate through the preferential uptake of tetrahedral borate B(OH)4 . In this study we revisit this assumption through a detailed solid state B magic angle spinning (MA...
متن کاملCrystal Growth Kinetics of Calcite in a Dense Fluidized-Bed Crystallizer
The growth kinetics of calcite crystals are studied in a batch-fluidized-bed crystallizer, which is maintained at a constant pH. The growth experiments are conducted in the metastable region explored as part of this research. The crystal growth rates are e®aluated from the consumption rates of calcium ions, using the cured natural calcite or silica sand as seeding materials. Se®eral operation ®...
متن کاملSynthesis and Characterization of New Sr3(BO3)2 Crystal for Stimulated Raman Scattering Applications
A new kind of borate crystalline material Sr3(BO3)2 with a similar calcite type structure was designed and synthesized by solid state reaction method, moreover, the single crystal growth was attempted with traditional Czochralski pulling method. Crystal phase of Sr3(BO3)2 was investigated by using X-Ray powder diffraction (XRPD) at room temperature and found similar to Ca3(BO3)2 crystal with sp...
متن کامل