Controlled Synthesis Of Micro/nano Nd₂O₃?Eu₂O₃ And Application

In this paper,the micro/nano Nd₂O₃ and Eu₂O₃ and their corresponding precursors were synthesized by different methods.The products were tested and analyzed by XRD?TG-DTG?FTIR?FESEM and the effects of different synthesis conditions on the products were investigated.The thermal decomposition kinetics of the precursor of Nd₂O₃and the surface modification dyeing of Eu₂O₃ were studied respectively.The specific research contents are as follows:?1?Synthesis of Nd₂O₃ and precursor NdOHCO₃ by hydrothermal method using neodymium nitrate and ammonium carbonate as raw materials.The results show that the precursor NdOHCO₃ and Nd₂O₃ are pure orthogonal phase and hexagonal phase by means of experiment and jade 6.5.The results show that the precursor is pure orthogonal phase and Nd₂O₃ is hexagonal phase.It was found that the morphology of the synthesized product was rod-like.When the reaction temperature was 170°C,the morphology of the product was a combination of rod-like and wheat-spike-like.With the increase of reaction concentration and reaction temperature,the size of products changed regularly with the increase of reaction time.The morphology of Nd₂O₃ obtained by calcination is basically consistent with that of its precursor NdOHCO₃.?2?The kinetic calculation of the thermal decomposition of NdOHCO₃ shows that the chemical reaction mechanism function of the first stage is g???=-ln?1-??,which is random nucleation and subsequent growth,and the activation energy is 209.05±5.39 kJ/mol.The preexponential factor is about 8.05×10^-6s^-1 and the thermodynamic three-function values??^*,?^*,?^*?are calculated and the first stage is non-spontaneous at room temperature.?3?Eu₂O₃ and precursor Eu2O?CO3?2·H2O were synthesized by homogeneous precipitation hydrothermal method using europium nitrate and anhydrous sodium carbonate as raw materials.The results showed that with the increase of reaction concentration,the product changed from octahedron and decahedron to octahedron and then to the combination of rod and octahedron.With the increase of reaction temperature,the morphology of Eu2O?CO3?2·H2O changed from semi-butterfly to octahedral and then to the combination of octahedron and decahedron.With the prolongation of reaction time,the morphology of precursor Eu2O?CO3?2·H2O changed from octahedron-like to butterfly-like and rod-like composition.?4?The surface modification of cerium oxide was used for polyester dyeing research.The research shows that the most suitable dyeing process is:disperse brilliant red GEL is 2%?owf?,dispersant NNO is 0.6 g/L,and esterified europium oxide 1%?owf?,dyeing temperature 100°C,dyeing time 60 min,bath ratio 100:1.