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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| Published in: | Journal of alloys and compounds Vol. 419; no. 1; pp. 50 - 53 |
|---|---|
| Main Authors: | , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Lausanne
Elsevier B.V
10-08-2006
Elsevier |
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| Abstract | 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. |
|---|---|
| AbstractList | A new tungstate Na8WO7.2H2O and molybdate compound (NH4)6Mo7O24.4H2O are used, respectively, as precursors to the preparation (in aqueous solutions and at room temperature) of Eu8(WO7)3.5H2O and Eu2Mo7O24.4H2O, respectively. It is verified that the emission intensity of the 5Do - > . 7F2 bands is higher (about three times) to Eu2Mo7O24.4H2O in comparison to Eu8(WO7)3.5H2O. From the obtained X-ray powders' diffraction patterns is concluded that Na8WO7.2H2O and Eu8(WO7)3.5H2O are isomorphs. Furthermore, it is inferred that Eu2Mo7O24-4H2O exhibits a structure similar to that of Eu8(WO7)3.5H2O. Furthermore, it is verified that the anhydrous Na8WO7 is stable in the 105-550 deg C range, Eu8(WO7)3 in the 110-350 deg C range and Eu2Mo7O24 in the 350-720 deg C range. 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. |
| Author | Farias, Robson F. de Airoldi, Claudio Belian, Mônica F. Alvres, Severino |
| Author_xml | – sequence: 1 givenname: Robson F. de surname: Farias fullname: Farias, Robson F. de email: robdefarias@yahoo.com.br organization: Departamento de Química, Universidade Federal de Roraima, Cx. Postal 167, 69301-970 Boa Vista, Roraima, Brazil – sequence: 2 givenname: Claudio surname: Airoldi fullname: Airoldi, Claudio organization: Instituto de Química, Universidade Estadual de Campinas, Cx. Postal 6154, 13084-971 Campinas, São Paulo, Brazil – sequence: 3 givenname: Mônica F. surname: Belian fullname: Belian, Mônica F. organization: Departamento de Química Fundamental, Universidade Federal, de Pernambuco, 50670-901 Recife, Pernambuco, Brazil – sequence: 4 givenname: Severino surname: Alvres fullname: Alvres, Severino organization: Departamento de Química Fundamental, Universidade Federal, de Pernambuco, 50670-901 Recife, Pernambuco, Brazil |
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| Cites_doi | 10.2298/JSC0405387d 10.1016/j.optmat.2004.08.080 10.1016/S0010-8545(99)00054-5 10.1016/S0925-3467(01)00184-7 10.1039/f19848001017 10.1016/j.electacta.2004.01.039 |
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| Keywords | Tungstates Molybdates Europium Luminescence Europium compounds Fluorescence XRD Ammonium compounds Synthesis Aqueous solutions Temperature effects Hydrates Crystal structure |
| Language | English |
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| References | Carson, Forissier, Vedrine (bib2) 1984; 1 de Farias, Alves, Belian, Vieira, de Souza, Pedrosa, de Sá (bib5) 2004; 69 de Farias, Alves, Belian, de Sà (bib4) 2002; 18 de Farias, Alves, Belian, de Sá (bib6) 2004; 23 de Souza, de Sá, de Azevedo, Alves, Robson, de Farias (bib7) 2005; 27 Alentejano, Aoki (bib1) 2004; 49 de Sá, Malta, de, Donegá, Simas, Longo, Santa-Cruz, da Silva (bib3) 2000; 196 Alentejano (10.1016/j.jallcom.2005.10.011_bib1) 2004; 49 de Farias (10.1016/j.jallcom.2005.10.011_bib6) 2004; 23 de Farias (10.1016/j.jallcom.2005.10.011_bib4) 2002; 18 de Farias (10.1016/j.jallcom.2005.10.011_bib5) 2004; 69 Carson (10.1016/j.jallcom.2005.10.011_bib2) 1984; 1 de Sá (10.1016/j.jallcom.2005.10.011_bib3) 2000; 196 de Souza (10.1016/j.jallcom.2005.10.011_bib7) 2005; 27 |
| References_xml | – volume: 23 start-page: 7 year: 2004 ident: bib6 publication-title: Bull. Chem. Technol. Macedônia contributor: fullname: de Sá – volume: 27 start-page: 1187 year: 2005 ident: bib7 publication-title: Optical Mater. contributor: fullname: de Farias – volume: 18 start-page: 431 year: 2002 ident: bib4 publication-title: Optical Mater. contributor: fullname: de Sà – volume: 49 start-page: 2779 year: 2004 ident: bib1 publication-title: Electrochim. Acta contributor: fullname: Aoki – volume: 196 start-page: 165 year: 2000 ident: bib3 publication-title: Coord. Chem. Ver. contributor: fullname: da Silva – volume: 69 start-page: 387 year: 2004 ident: bib5 publication-title: J. Srb. Chem. Soc. contributor: fullname: de Sá – volume: 1 start-page: 1017 year: 1984 ident: bib2 publication-title: J. Chem. Soc. Faraday Trans. contributor: fullname: Vedrine – volume: 69 start-page: 387 year: 2004 ident: 10.1016/j.jallcom.2005.10.011_bib5 publication-title: J. Srb. Chem. Soc. doi: 10.2298/JSC0405387d contributor: fullname: de Farias – volume: 27 start-page: 1187 year: 2005 ident: 10.1016/j.jallcom.2005.10.011_bib7 publication-title: Optical Mater. doi: 10.1016/j.optmat.2004.08.080 contributor: fullname: de Souza – volume: 196 start-page: 165 year: 2000 ident: 10.1016/j.jallcom.2005.10.011_bib3 publication-title: Coord. Chem. Ver. doi: 10.1016/S0010-8545(99)00054-5 contributor: fullname: de Sá – volume: 18 start-page: 431 year: 2002 ident: 10.1016/j.jallcom.2005.10.011_bib4 publication-title: Optical Mater. doi: 10.1016/S0925-3467(01)00184-7 contributor: fullname: de Farias – volume: 1 start-page: 1017 year: 1984 ident: 10.1016/j.jallcom.2005.10.011_bib2 publication-title: J. Chem. Soc. Faraday Trans. doi: 10.1039/f19848001017 contributor: fullname: Carson – volume: 49 start-page: 2779 year: 2004 ident: 10.1016/j.jallcom.2005.10.011_bib1 publication-title: Electrochim. Acta doi: 10.1016/j.electacta.2004.01.039 contributor: fullname: Alentejano – volume: 23 start-page: 7 year: 2004 ident: 10.1016/j.jallcom.2005.10.011_bib6 publication-title: Bull. Chem. Technol. Macedônia contributor: fullname: de Farias |
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| Snippet | 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... A new tungstate Na8WO7.2H2O and molybdate compound (NH4)6Mo7O24.4H2O are used, respectively, as precursors to the preparation (in aqueous solutions and at room... |
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| SubjectTerms | 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 |
| Title | Synthesis, characterization and fluorescence study of Eu(III) tungstates and molybdates |
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