Reference

Quaternary fluorides

Quaternary fluorides.Some chemicals with cas registry numbers like 12032-20-1 and 140445-03-0 are also used. Koch, J.; Hebecker, C. (Inst. Anorg. Anal. Chem., Justus-Liebig-Univ., Giessen W-6300, Germany). Z. Anorg. Allg. Chem., 607, 121-3 (German) 1992. CODEN: ZAACAB. ISSN: 0044-2313. DOCUMENT TYPE: Journal CA Section: 78 (Inorganic Chemicals and Reactions) Section cross-reference(s): 75 M2IMIILnF7 (MI = Na, Ag; MII = Ca, Cd; Ln = Er-Lu) were prepd. and examd. with x-ray diffraction. All these compds. crystd. in a fcc. lattice. Colorless single crystals of Na2CdYbF7 were obtained, and the structure was detd. Na2CdYbF7 crystd. as space group Fm3m, a 541.4 pm, R = 0.0222, Rw = 0.0196. The single-crystal diffraction data refer to a defect-fluorite-structure. .

Structural and spectroscopic characterization of Lu2O3:Eu nanocrystalline spherical particles

Structural and spectroscopic characterization of Lu2O3:Eu nanocrystalline spherical particles. Trojan-Piegza, J.; Zych, E.; Hreniak, D.; Strek, W.; Kepinski, L. (Faculty of Chemistry, University of Wroclaw, Wroclaw 50-383, Pol.). Journal of Physics: Condensed Matter, 16(39), 6983-6994 (English) 2004 Institute of Physics Publishing. CODEN: JCOMEL. ISSN: 0953-8984. DOCUMENT TYPE: Journal CA Section: 73 (Optical, Electron, and Mass Spectroscopy and Other Related Properties) Section cross-reference(s): 66 Spherical particles of Lu2O3:x% Eu, with x varying from 0% to 10% with respect to Lu, were prepd. by pptg. hydroxides with urea at 80°C and subsequently decompg. these hydroxides to oxides at 650°C. TEM pictures revealed that the spherical particles were very uniform in size and their diams. were about 130 nm. Each of the particles consisted of crystallites about 20 nm in diam. Luminescence and excitation spectra contained all the characteristic features of the Eu3+ ion. The most intense line in the emission was located around 611 nm. Energy transfer was obsd. from the Eu3+ ions occupying the S6(C3i) centrosym. site to the Eu3+ located in the non-centrosym. position of C2 symmetry. The decay kinetics were slightly non-exponential, esp. for the lowest dopant concns. At liq. 12032-20-1 and 7440-53-1 are cas registry numbers of chemicals which are used as reagents here. nitrogen temp. the av. decay time for the 0.2% powder was shorter by about 40% compared to the 3-10% materials. At room temp. the av. decay time varies only slightly. Rise times were obsd. for all concns. at room temp. but only for higher concns. at liq. nitrogen temp. This effect is in contrast to that of nanoparticles of Lu2O3:Eu prepd. using different synthesis procedures. .