Effect of Thermal Annealing on the Kinetics of Rehydroxylation of Eu3+:La2O3 Nanocrystals

被引：21

作者：

Mendez, Maria ^{[1
,2
,3
,4
]}

Cesteros, Yolanda ^{[2
]}

Francesc Marsal, Lluis ^{[3
]}

Giguere, Alexandre ^{[5
]}

Drouin, Dominique ^{[5
]}

Salagre, Pilar ^{[2
]}

Formentin, Pilar ^{[3
]}

Pallares, Josep ^{[3
]}

Aguilo, Magdalena ^{[1
,4
]}

Diaz, Francesc ^{[1
,4
]}

Josep Carvajal, Joan ^{[1
,4
]}

机构：

[1] URV, Fis & Cristal Log Mat FiCMa FiCNA, E-43007 Tarragona, Spain

[2] URV, Dept Quim Fis & Inorgan, GreenCat EMaS, E-43007 Tarragona, Spain

[3] URV, Dept Elect Engn, Nephos EMaS, E-43007 Tarragona, Spain

[4] URV, EMaS, E-43007 Tarragona, Spain

[5] Univ Sherbrooke, Dept Elect & Comp Engn, Sherbrooke, PQ J1K 2R1, Canada

来源：

INORGANIC CHEMISTRY | 2012年 / 51卷 / 11期

关键词：

LA2O3; HYDROGEN; SIALON; NANOPARTICLES; SPECTROSCOPY; COMPOSITE; CATALYSTS; ZIRCONIA; SUPPORT; OXIDES;

D O I：

10.1021/ic300108f

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Europium-doped lanthanum oxide (5 mol % Eu3+:La2O3) was prepared by calcining europium-doped lanthanum hydroxide (5 mol % Eu3+:La(OH)(3)) previously synthesized by a simple hydrothermal method. Interestingly, we observed different emission Eu3+ signatures depending on the phase of the host (lanthanum oxide or hydroxide) by cathodoluminescence. Taking into account that lanthanum oxide easily rehydroxylates in air, for the first time, we report the use of cathodoluminiscence as a novel characterization technique to follow the lanthanum oxide rehydroxylation reaction versus time according to different annealing procedures. Additionally, differential thermal-thermogravimetric analysis, infrared spectroscopy, and X-ray diffraction techniques were used to identify the phases formed from the Eu3+:La(OH)(3) depending on temperature and to study the evolution of La2O3 to La(OH)(3) versus time. The results showed that the higher the temperature and the longer the annealing time, the higher the resistance to rehydroxylation of the Eu3+:La2O3 sample.

引用

页码：6139 / 6146

页数：8

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