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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Bibliographic Details
Published in:	Journal of alloys and compounds Vol. 419; no. 1; pp. 50 - 53
Main Authors:	Farias, Robson F. de, Airoldi, Claudio, Belian, Mônica F., Alvres, Severino
Format:	Journal Article
Language:	English
Published:	Lausanne Elsevier B.V 10-08-2006 Elsevier
Subjects:	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 Tungstates Molybdates Europium Luminescence Europium compounds Fluorescence XRD Ammonium compounds Synthesis Aqueous solutions Temperature effects Hydrates Crystal structure
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Summary:	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.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0925-8388 1873-4669
DOI:	10.1016/j.jallcom.2005.10.011