Synthesis of zirconium (hafnium) fluoride compounds and their X-ray luminescence properties |
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Authors: | M M Godneva D L Motov N N Boroznovskaya V M Klimkin |
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Institution: | (1) Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Research Center, Russian Academy of Sciences, ul. Fersmana 14, Apatity, Murmansk oblast, 184209, Russia;(2) Tomsk State University, pr. Lenina 36, Tomsk, 634050, Russia;(3) Institute of Atmosphere Optics, Siberian Division, Russian Academy of Sciences, Akademicheskii pr. 1, Tomsk, 634055, Russia |
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Abstract: | Twenty-five zirconium (hafnium) fluoride compounds have been synthesized at room temperature in the systems MO2-H2SO4-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 Rb2Zr3OF12, are strongly luminescing compounds. |
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