14596-11-3Relevant academic research and scientific papers
New heptafluorozirconates and -hafnates AIBIIZr(Hf) F7 (AI = Rb, Tl; BII = Ca, Cd) - Synthesis, structures, and structural relationships
Meddar, Lynda,El-Ghozzi, Malika,Avignant, Daniel
, p. 565 - 570 (2008)
Four new ABZrF7 heptafluorozirconates (A = Rb, Tl; B = Ca, Cd) and their homologous heptafluorohafnates, all colorless, orthorhombic Cmcm (n°63), Z = 4, have been synthesized by heating stoichiometric mixtures of RbF or TlF, CaF2 or CdF2 and ZrF4 (HfF 4) in sealed platinum tubes at temperature ranging from 550°C (Tl) to 600°C (Rb). The crystal structures of both RbCdZrF7 and TlCdZrF7 have been solved from single-crystal X-rays diffraction data. Rietveld refinements were performed from X-rays powder patterns for RbCaZrF7 and TlCaZrF7. In this series of heptafluorides, both B2+ and Zr4+ cations exhibit a pentagonal bipyramidal 7-coordination. Their structural relationships with other heptafluorozirconates AIBIIZrF7 as well as β-KYb 2F7 are discussed. RbCaZrF7: a = 6.863(1) A, b = 11.130(1) A, c = 8.485(1) A; TlCaZrF7: a = 6.868(1) A b = 11.165(1) A, c = 8.486(1) A; RbCdZrF 7: a = 6.780(1) A, b = 11.054(4) A, c = 8.420(4) A; TlCdZrF7: a = 6.784(3) A b = 11.099(2) A, c = 8.424(9) A.
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.
