Molybdenum crucibles are very suitable for the development of a new generation of thermoelectric materials, especially in experiments that require material synthesis, smelting or heat treatment in a high temperature, inert, high-purity environment. Their unique physical and chemical stability makes them an ideal choice.
Why are molybdenum crucibles suitable for thermoelectric material development?
1. High temperature tolerance
New thermoelectric materials such as silicon-germanium (SiGe) alloys, **oxide thermoelectrics (such as Ca₃Co₄O₉) or chalcogenides (such as SnSe, PbTe) usually need to be sintered or melted at temperatures as high as 1000℃~2000℃.
Molybdenum crucible has a high melting point (2620°C) and can work safely in vacuum, high-purity inert atmosphere or hydrogen environment, and is suitable for high-temperature heat treatment.
2. Chemical inertness and low pollution
Molybdenum is non -reactive to most thermoelectric materials and is not easily introduced with impurities. It is particularly suitable for thermoelectric systems that are sensitive to doping or require high purity (such as Bi₂Te₃, Mg₂Si, etc.) .
3. Good thermal conductivity
The performance of thermoelectric materials strongly depends on temperature difference control. Molybdenum has excellent thermal conductivity, which helps the sample to be heated evenly and improves experimental reproducibility.
4. Suitable for vacuum and atmosphere control experiments
Most thermoelectric materials need to be processed in a vacuum or inert gas (such as Ar, N₂) to prevent oxidation. Molybdenum crucibles are extremely stable in such environments and can be used for closed melting or evaporation experiments.
In which thermoelectric material research have molybdenum crucibles been used?
Mg ₂ Si, Mg ₃ Sb ₂ series: high-performance n-type thermoelectric materials, need to be synthesized at high temperature in an inert environment, and molybdenum crucibles are often used.
PbTe, SnSe, Bi₂Te₃ series: used for fine smelting and crystal growth, requiring low pollution and anti-volatility.
melting point oxide thermoelectric materials (such as SrTiO₃ derivatives): Molybdenum crucibles can be used as linings or reaction vessels in oxidizing atmospheres.
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