Yttrium Disilicide（YSi2） 

 

                

Chinese name: yttrium silicide

English name: YTTRIUM SILICIDE

CAS：12067-55-9

EINECS:235-080-8

Chemical formula: Si2Y

Molecular weight: 145.08

Melting point: 1520 ℃

Density: 4.39 g/cm3

Crystal system: low-temperature orthorhombic crystal system, high-temperature tetragonal crystal system

Resistivity: The resistivity is greater than that of yttrium metal. The resistance temperature coefficient is positive, but it is negative at 500 ℃.

It is easy to react with hydrochloric acid and hydrofluoric acid, and is insoluble in H2O.

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.