Apparent Activation Energy and Luminescence Properties of Gd2Ti2O7:Ce Particles

作者：Liu Jianan; Ma Weimin^*; Ma Lei; Ji Lianyong; Wu Ying; Wang Hualei; Guan Renguo

来源：Rare Metal Materials and Engineering, 2016, 45(3): 802-809.

• Gd2Ti2O7:Ce nanoparticles
• thermal analysis kinetics
• activation energy
• luminescence property

Gd2Ti2O7:Ce nanoparticles were prepared wider different initial solution concentrations by a co-precipitation method. The phase composition, particle morphology and luminescence properties of the samples were characterized by XRD, SEM and TG-DTA, respectively. Their thermal analysis kinetics and activation energy in the synthesis process were also calculated at different heating rates. Results show that there are three stages in the process of the precursor's phase transformations during heating. When the initial solution concentrations are 0.08 mol/L and 0.04 mol/L, the average apparent activation energies of the three reaction stages of precursors are 42.43, 145.58, 381.98 kJ.mol(-1) and 51.28, 161.51, 446.30 kJ.mol(-1), respectively, calculated by the Doyle-Ozawa and Kissinger methods. Meanwhile, the grain growth activation energies of the two concentrations 0.08 mol/L and 0.04 mol/L are 12.58 kJ.mol(-1) and 19.54 kJ.mol(-1), respectively. It is concluded that nanoparticles with higher surface activity have the best luminescence property when calcined at 1173 K for 2 h, especially the samples doped with 0.7 mol% Ce is optimal at the concentration of 0.08 mol/L.

• 出版日期2016-3
• 单位东北大学; 沈阳化工大学