Lanthanum disilicide is a binary inorganic compound of lanthanum metal and silicon with the formula . Many other lanthanum silicides are known.
Synthesis Combine silicon and lanthanum powders, compress the mixture into solid blocks, and melt under vacuum conditions.
React lanthanum, silicon, and mercury in a quartz tube at 450 °C for 10–12 hours. Subsequently, eliminate surplus mercury through distillation, followed by annealing the resultant material at 450–600 °C.
Physical properties Lanthanum disilicide forms gray crystals. can exist in two crystal structures: tetragonal (α- type) and orthorhombic (α- type).
The compound is known for its metallic behavior and various applications.
Chemical properties reacts with hydrochloric acid and hydrofluoric acid; insoluble in water.
Uses The -powder is characterized by high electrical resistivity, minimal thermal expansion, and outstanding thermal stability. These properties make it potentially useful for applications in electric heating devices, high-temperature sensors, refractory ceramics, thermal tools, and materials designed for efficient heat conduction.
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