Lanthanum disilicide is a binary inorganic compound of lanthanum metal and silicon with the formula LaSi2. Many other lanthanum silicides are known.[2]
Combine silicon and lanthanum powders, compress the mixture into solid blocks, and melt under vacuum conditions.[3]
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.[3]
Physical properties
Lanthanum disilicide forms gray crystals. LaSi2 can exist in two crystal structures: tetragonal (α-GdSi2 type) and orthorhombic (α-ThSi2 type).[1][4]
The compound is known for its metallic behavior and various applications.[5]
The LaSi2-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.[3]
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