Synthesis of Gd2SiO5 nano-powders by cocurrent chemical co-precipitation method

Abstract

In this paper, nano-sized Gd2SiO5 powder was synthesized by a cocurrent chemical co-precipitation method with Gd2O3 and TEOS as raw materials. The thermal behavior of precursor, phase composition and microstructure of the obtained powder were investigated, the synthesis mechanism was also discussed. The results show that lower Gd：Si molar ratio in precursor and higher pH value in reaction system can lead to the formation of Gd9.33(SiO4)6O2 phase. On the contrary, Gd2O3 impurity is formed in the obtained Gd2SiO5 powder. In this study, the relatively pure Gd2SiO5 powder can be synthesized at 1000-1300 ℃ with Gd/Si molar ratio as 20：11 and pH value in the range of 9-10. The obtained powder inhibits irregular morphology with average grain size of 100-200 nm. During the synthesis process, the precursor is generated in the form of —[Si—O—Gd]— network, and then translated to Gd2SiO5 grains, as well as Gd9.33(SiO4)6O2 and Gd2O3 impurities.

Keywords

• gd2sio5 powder
• cocurrent co-precipitation
• gd/si molar ratio
• ph value
• synthesis mechanism