High-pressure Synthesis and Characterization of the Rare-earth Borate La4B10O21
نویسندگان
چکیده
The lanthanum(III)-decaborate La4B10O21 was synthesized under high-pressure/high-temperature conditions of 2.6 GPa and 750 ◦C in a Walker-type multianvil apparatus. The single-crystal structure determination revealed that La4B10O21 is isotypic to Pr4B10O21. La4B10O21 crystallizes monoclinically with four formula units in the space group P21/n with the lattice parameters a = 716.7(2), b = 1971.5(4), c = 958.3(2) pm, and β = 93.7(1)◦. The three-dimensional boron-oxygen framework consists of [BO4]5− tetrahedra and trigonal-planar [BO3]3− groups. The structure contains four crystallographically different lanthanum ions. Two of the ions are surrounded by 10, one by 11, and the fourth one by 12 oxygen anions. In addition to IR-spectroscopic investigations, DFT calculations were performed to support the assignment of vibrational bands.
منابع مشابه
High-pressure Synthesis and Crystal Structure of the Borate Sc3B5O12
The rare-earth borate Sc3B5O12 was synthesized under high-pressure / high-temperature conditions of 6 GPa and 1100 ◦C in a Walker-type multianvil apparatus. The single-crystal structure determination revealed an isotypy to RE3B5O12 (RE = Er–Lu). Sc3B5O12 crystallizes in the rare space group Pmna (Z = 4) with the parameters a = 1245.4(3), b = 443.46(9), c = 1222.1(2) pm, V = 0.675(1) nm3, R1 = 0...
متن کاملSynthesis of strontium borate doped with Pb by solid state method and characterization of its thermoluminescent glow curve
Strontium Tetraborate doped with Lead SrB4O7:Pb powder was prepared by solid state method. The formation of Strontium Tetraborate compound was analyzed by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). Thermoluminescence Glow Curve of gamma irradiated sample was investigated in order to use as a thermoluminescent dosimeter. Because of excellent mechanical properties, non-hygros...
متن کاملFacile Fabrication of Boron-Doped Titania Nanopowders by Atmospheric Pressure Chemical Vapor Synthesis Route and its Photocatalytic Activity
The Atmospheric Pressure Chemical Vapor Synthesis (APCVS) route is a process that can be used for the synthesis of doped-nanocrystalline powders with very small crystallite sizes having a narrow particle size distribution and high purity. In this study, APCVS technique was used to prepare boron-doped titania nanopowders. The effects of temperature, borate flow rate and water flow rate on the am...
متن کاملSynthesis and Characterization of Amine-modified Mesoporous SBA-15 for Carbon Dioxide Sequestration at High Pressure and Room Temperature (RESEARCH NOTE)
Amine-modified mesoporous SBA-15 adsorbent has been prepared by impregnation method using tetraethylenepentamine. The samples of this modified SBA-15 have been characterized by small angle X-ray scattering (SAXS), Scanning electron microscopy (SEM), Nitrogen adsorption-desorption isotherm and FT-IR. The adsorption capacity of CO2 on unmodified and modified samples were measured at high pressure...
متن کاملDetermination of Rare Earth Elements in Products of Chadormalu Iron Ore Concentrator Plant (Iran) from Beneficiation Point of View
Different samples have been prepared from different products in Chadormalu iron ore concentrator plant: Low intensity magnetite separators concentrate (magnetite concentrate), reverse flotation tail (final hematite concentrate), flotation concentrate (apatite concentrate), final tail (L.I.M.S. tail + reverse flotation concentrate+ apatite flotation tail). The samples were used for rare eart...
متن کامل