caa a22 4500 463224698 CHVBK 20180405153223.0 cr unu---uuuuu 170326e20070401xx s 000 0 eng 10.1007/s10853-006-0077-9 doi (NATIONALLICENCE)springer-10.1007/s10853-006-0077-9 Nonhydrolytic sol-gel synthesis and characterization of YAG [Elektronische Daten] [Eduardo Nassar, Paula dos Santos Pereira, Evelisy de Oliveira Nassor, Lilian Ávila, Katia Ciuffi, Paulo Calefi] Yttrium-aluminum oxides are interesting compounds, which are widely used as hosts for lasers and phosphors due to their stable physical and chemical properties. The manufacture of YAG has been investigated thoroughly. YAG powders are traditionally synthesized through the reaction of aluminum and yttrium powders at high temperatures. The work reported here involved an investigation into the preparation of YAG by a nonhydrolytic sol-gel route and the influence of heating time at low temperatures to obtain YAG from inorganic precursors (yttrium and aluminum chloride). AlCl3, YCl3 and ethanol were reflux reacted under an argon atmosphere. Europium III chloride was added as a structural probe. The powder was treated at 800°C for 1, 2, 4, 8 and 16h. The YAG structure was analyzed by X-ray diffraction (XRD), nuclear magnetic resonance (NMR), thermal analysis (TA) and photoluminescence (PL). The XRD revealed only peaks corresponding to the YAG phase. PL data showed that the YAG phase was formed in 2min with samples pretreated at 50°C. For the samples pretreated at 800°C, the YAG phase appeared in 30s. The excitation spectra presented a maximum of 394nm corresponding to the 5L6 level, while the emission spectra of Eu III ions showed characteristic transition bands arising from the 5D0 → 7F J (J=1, 2, 3, 4) manifolds at maximum excitation. The magnetic dipole 5D0 → 7F1 transition exhibited greater intensity than the electric dipole 5D0 → 7F2 transition. This methodology proved efficient for obtaining YAG phase. Springer Science+Business Media, LLC, 2007 Nassar Eduardo Universidade de Franca, Av.Dr.Armando Salles Oliveira, 201, 14404-600, Franca, SP, Brazil aut dos Santos Pereira Paula Universidade de Franca, Av.Dr.Armando Salles Oliveira, 201, 14404-600, Franca, SP, Brazil aut de Oliveira Nassor Evelisy Universidade de Franca, Av.Dr.Armando Salles Oliveira, 201, 14404-600, Franca, SP, Brazil aut Ávila Lilian Universidade de Franca, Av.Dr.Armando Salles Oliveira, 201, 14404-600, Franca, SP, Brazil aut Ciuffi Katia Universidade de Franca, Av.Dr.Armando Salles Oliveira, 201, 14404-600, Franca, SP, Brazil aut Calefi Paulo Universidade de Franca, Av.Dr.Armando Salles Oliveira, 201, 14404-600, Franca, SP, Brazil aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/7(2007-04-01), 2244-2249 0022-2461 42:7<2244 2007 42 10853 https://doi.org/10.1007/s10853-006-0077-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-0077-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nassar Eduardo Universidade de Franca, Av.Dr.Armando Salles Oliveira, 201, 14404-600, Franca, SP, Brazil aut NATIONALLICENCE 700 1- dos Santos Pereira Paula Universidade de Franca, Av.Dr.Armando Salles Oliveira, 201, 14404-600, Franca, SP, Brazil aut NATIONALLICENCE 700 1- de Oliveira Nassor Evelisy Universidade de Franca, Av.Dr.Armando Salles Oliveira, 201, 14404-600, Franca, SP, Brazil aut NATIONALLICENCE 700 1- Ávila Lilian Universidade de Franca, Av.Dr.Armando Salles Oliveira, 201, 14404-600, Franca, SP, Brazil aut NATIONALLICENCE 700 1- Ciuffi Katia Universidade de Franca, Av.Dr.Armando Salles Oliveira, 201, 14404-600, Franca, SP, Brazil aut NATIONALLICENCE 700 1- Calefi Paulo Universidade de Franca, Av.Dr.Armando Salles Oliveira, 201, 14404-600, Franca, SP, Brazil aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/7(2007-04-01), 2244-2249 0022-2461 42:7<2244 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer