15298-38-1Relevant articles and documents
Preparation and characterization of high-purity metal fluorides for photonic applications
Patterson, Wendy M.,Stark, Peter C.,Yoshida, Thomas M.,Sheik-Bahae, Mansoor,Hehlen, Markus P.
, p. 2896 - 2901 (2011/12/22)
We combine chelate-assisted solvent extraction (CASE) and hot hydrogen fluoride gas treatment to enable a general method for the preparation of high-purity binary metal fluorides. The fluorozirconate glass ZBLANI:Yb 3+ (ZrF4-BaF2-LaF3-AlF 3-NaF-InF3-YbF3), a solid-state laser-cooling material, is used as a test case to quantitatively assess the effectiveness of the purification method. The reduction of transition-metal and oxygen-based impurities is quantified directly by inductively coupled plasma mass spectrometry (ICP-MS) and indirectly by laser-induced cooling, respectively. The concentrations of Cu, Fe, Co, Ni, V, Cr, Mn, and Zn impurities in the ZrCl 2O precursor solution were measured individually by ICP-MS at various stages of the purification process. CASE was found to reduce the total transition-metal concentration from 72500 to ～100 ppb. Laser cooling was most efficient in ZBLANI:Yb3+ glass fabricated from CASE-purified metal fluoride precursors, confirming the results of the ICP-MS analysis and demonstrating the effectiveness of the purification methods in a finished optical material. High-purity metal fluorides prepared by the methods presented herein will enable new high-performance optical materials for solid-state optical refrigerators, crystals for vacuum ultraviolet (VUV) spectroscopy of the Thorium-229 nucleus, VUV optics, fibers, and thin-film coatings.
Synthesis of zirconium (hafnium) fluoride compounds and their X-ray luminescence properties
Godneva,Motov,Boroznovskaya,Klimkin
, p. 661 - 666 (2008/10/09)
Twenty-five zirconium (hafnium) fluoride compounds have been synthesized at room temperature in the systems MO2-H2SO 4-M′nA(HF)-H2O (M = Zr (Hf); M′ = Na, K, Rb, Cs, NH4; A = F, SO4) and their X-ray luminescence spectra (luminescence wavelengths and relative intensities) have been measured. The X-ray luminescence of the compounds has been considered as a function of the composition (cations, anions, water content) and different structural factors (CNs, polyhedra, H-bonds). Ammonium compounds do not luminesce, and sodium fluorozirconates and heptafluorozirconates are weakly luminescing. Hexafluorozirconates M2Zr(Hf)F6 (M= K, Rb, Cs) and M5Zr4F21 ? 3H2O (M = Rb, Cs), as well as oxofluorozirconate Rb2Zr3OF 12, are strongly luminescing compounds. Nauka/Interperiodica 2007.
Structure of Sr5Zr3F22 determined from an inversion twinned crystal
Bail, Le A.
, (2008/10/08)
Synthesized from hydrothermal conditions, Sr5Zr3F22 crystallizes in the orthorhombic symmetry with a = 7.655(1)?, b = 10.313(1)? and c =10.255(1)?, space group P21212, Z = 2. The structure is determined from 3999 independent reflections including the Friedel opposites and re fined up to the residual R(1) = 0.036. Inversion twinning is evedenced with a Flack parameter refined to x = 0.377(4). The structure is built upfrom [ZrF8] corner sharing square antiprisms forming infinite layers [Z r3F20](n)(8n-) parallel to the ab plane. Most of the Sr atoms adopt the square antiprism coordination too, distorted. One fluorine atom is in a triangular coordination [Fsr3]. The presence of hydroxyl groups seems tobe rulled out in spite of bond valence anomalies.
