Isopiestic studies on the quaternary system (water + methanol+ sodium bromide + ammonium bromide) at the temperature 298.15 K: comparison with the ideal-like solution model

2000 ◽  
Vol 32 (3) ◽  
pp. 389-392 ◽  
Author(s):  
Mei Wang ◽  
Dong-Mei Yang ◽  
Shu-Ping Sun ◽  
Zhi-Chang Wang
1984 ◽  
Vol 21 (3) ◽  
pp. 132-136
Author(s):  
J. Martinez ◽  
J. A. Gonzalez ◽  
J.M. Moraga ◽  
J. Pereda

2014 ◽  
Vol 609-610 ◽  
pp. 346-350 ◽  
Author(s):  
Yu Rong Zhong ◽  
Man Zhao ◽  
Bao Long Xu

Europium-doped lutetium (Lu2O3:Eu3+ ) powders were prepared by micro-emulsion method. A small amount of an aqueous solution of Lu(NO3)3, Eu(NO3)3 and aqueous ammonia was slowly dropped into the water-in-oil micro-emulsion system (water / cetyl trimethyl ammonium bromide (CTAB) / n-butyl alcohol and cyclohexane) under vigorous stirring at 80 °C. The precipitates were obtained by Ostwald’s ripening at 250 °C for 6 h, which were then heated at 400 °C, 600 °C and 800 °C. The SEM morphology showed that the powders were rods of about few hundred nanometers in length and 40 nm in diameter. The spectrograms of X-ray diffraction (XRD) demonstrated that the Lu2O3:Eu3+ crystallinity was enhanced with the increasing of temperature. The photoluminescence results revealed that the intense emission bands centered at 612 nm. This method provides a new way to obtain different morphology and luminescent properties of Lu2O3:Eu3+ powder.


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