CAS No.: 12067-55-9
Molecular formula: YSi2
Molecular weight: 145.08
EINECS No.: 235-080-8
Properties: orthorhombic system at low temperature and tetragonal system at high
temperature. The melting point is 1520 ℃. The resistivity is higher than that of metal
yttrium, and the resistance temperature coefficient is positive, but it is negative at 500 ℃.
Easy to interact with hydrochloric acid and hydrofluoric acid.
Solubility: Easy to interact with hydrochloric acid and hydrofluoric acid
Conductivity: YSi2 exhibits a metal like behavior with a very high electron concentration, a higher resistivity than metal yttrium, and a positive coefficient of resistance temperature 1. This leads to a very high conductivity of thermoelectric properties (≈ 18 × 105 Ω − 1 m − 1), but the Seebeck coefficient is small (− 26 µ V K-1) and decreases with increasing temperature. The thermal conductivity is approximately 14-19 W m − 1 K − 1 for all temperature ranges. The maximum ZT value at 423 is 0.026 K
Production process: Large YSi2 blocks are prepared by arc melting high-purity silicon and yttrium raw materials. The ingot is crushed into powder and compacted by spark plasma sintering to form high-density particles.
Application field: Yttrium and silicon are key components used to manufacture solar panels, yttrium is used to absorb light energy, and silicon is the main substrate for solar panels.