Synthesis, characterization and fluorescence study of Eu(III) tungstates and molybdates

A new tungstate Na 8WO 7·2H 2O and molybdate compound (NH 4) 6Mo 7O 24·4H 2O are used, respectively, as precursors to the preparation (in aqueous solutions and at room temperature) of Eu 8(WO 7) 3·5H 2O and Eu 2Mo 7O 24·4H 2O, respectively. It is verified that the emission intensity of the 5D 0 → 7F...

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Veröffentlicht in:	Journal of alloys and compounds 2006-08, Vol.419 (1), p.50-53
Hauptverfasser:	Farias, Robson F. de, Airoldi, Claudio, Belian, Mônica F., Alvres, Severino
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Europium Exact sciences and technology Inorganic compounds Luminescence Molybdates Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation Other solid inorganic materials Photoluminescence Physics Structure of solids and liquids crystallography Structure of specific crystalline solids Tungstates
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container_title	Journal of alloys and compounds
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creator	Farias, Robson F. de Airoldi, Claudio Belian, Mônica F. Alvres, Severino
description	A new tungstate Na 8WO 7·2H 2O and molybdate compound (NH 4) 6Mo 7O 24·4H 2O are used, respectively, as precursors to the preparation (in aqueous solutions and at room temperature) of Eu 8(WO 7) 3·5H 2O and Eu 2Mo 7O 24·4H 2O, respectively. It is verified that the emission intensity of the 5D 0 → 7F 2 bands is higher (about three times) to Eu 2Mo 7O 24·4H 2O in comparison to Eu 8(WO 7) 3·5H 2O. From the obtained X-ray powders’ diffraction patterns is concluded that Na 8WO 7·2H 2O and Eu 8(WO 7) 3·5H 2O are isomorphs. Furthermore, it is inferred that Eu 2Mo 7O 24·4H 2O exhibits a structure similar to that of Eu 8(WO 7) 3·5H 2O. Furthermore, it is verified that the anhydrous Na 8WO 7 is stable in the 105–550 °C range, Eu 8(WO 7) 3 in the 110–350°C range and Eu 2Mo 7O 24 in the 350–720 °C range.
doi_str_mv	10.1016/j.jallcom.2005.10.011
format	Article
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It is verified that the emission intensity of the 5D 0 → 7F 2 bands is higher (about three times) to Eu 2Mo 7O 24·4H 2O in comparison to Eu 8(WO 7) 3·5H 2O. From the obtained X-ray powders’ diffraction patterns is concluded that Na 8WO 7·2H 2O and Eu 8(WO 7) 3·5H 2O are isomorphs. Furthermore, it is inferred that Eu 2Mo 7O 24·4H 2O exhibits a structure similar to that of Eu 8(WO 7) 3·5H 2O. 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It is verified that the emission intensity of the 5D 0 → 7F 2 bands is higher (about three times) to Eu 2Mo 7O 24·4H 2O in comparison to Eu 8(WO 7) 3·5H 2O. From the obtained X-ray powders’ diffraction patterns is concluded that Na 8WO 7·2H 2O and Eu 8(WO 7) 3·5H 2O are isomorphs. Furthermore, it is inferred that Eu 2Mo 7O 24·4H 2O exhibits a structure similar to that of Eu 8(WO 7) 3·5H 2O. 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title	Synthesis, characterization and fluorescence study of Eu(III) tungstates and molybdates
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