NEODYMIUMSILICDE 
CAS number: 12137-04-1 
Molecular formula: NdSi2 
Molecular weight: 200.41 
EINECS number: 235-234-4 

Preparation: 
1) The mixture of Nd, Si, and Hg is heated in a quartz tube using an electric furnace at a temperature of about 450 ℃ for 10-12 hours, and excess mercury is removed by distillation using a curved tube. After the mercury is collected at the cold end of the tube, the product is annealed at 450-600 ℃ at the hot end of the tube. 
2) Weigh Nd2O3 and Si (continuously aspirated) according to the stoichiometric relationship, and react under vacuum conditions in an alumina boat to quickly and completely remove SiO formed during the reaction. The reaction temperature is controlled between 1100~1600 ℃, and when it exceeds 1600 ℃, impurities are usually mixed due to the participation of the container in the reaction. 
Application: 
(1) Neodymium silicide is an inorganic rare earth metal silicate mainly used in chemical research and development production processes. 
(2) Neodymium silicon alloy also has excellent mechanical properties, such as high hardness, high strength, and good plasticity. These properties make neodymium silicon alloy one of the ideal materials for preparing high-purity metal sputtering coatings. 
(3) Neodymium silicon alloy has a high melting point, good conductivity, and thermal conductivity, making it widely used in fields such as electronics, communication, aerospace, and automobiles.