Novel germanium telluride based thermo-electric material with high thermo-electric performance and preparation method thereof
A technology of thermoelectric properties and thermoelectric materials, which is applied in the directions of thermoelectric device junction lead-out materials, chemical instruments and methods, selenium/tellurium compounds, etc. production effect
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[0050] The second technical solution of the present invention provides a method for preparing a novel germanium telluride-based thermoelectric material with high thermoelectric performance as described above, comprising the following steps:
[0051] (1) Vacuum packaging:
[0052] Weigh the elemental raw materials Ge, Cu, Pb, Se and Te according to the stoichiometric ratio, put them into a quartz tube and vacuum seal;
[0053] (2) Melt quenching:
[0054] Heating the quartz tube containing the simple raw material to make the raw material react in a molten state, and then obtain a molten ingot after water quenching;
[0055] (3) Annealing and quenching:
[0056] Reheating the obtained molten ingot to raise the temperature, heat preservation and annealing at a temperature below the melting point, and then water quenching to obtain an annealed ingot;
[0057] (4) Hot pressed samples:
[0058] The obtained annealed ingot is ground into powder, and hot pressed to obtain a disc m...
Embodiment 1
[0071] A novel telluride thermoelectric material, which is expressed as (Ge 1-x Cu 2x Te) 1-y (PbSe) y Alloy (x=0.02, 0≤y≤0.25), its preparation method comprises the following steps:
[0072] (1) Ge, Cu, Pb, Se and Te are used as raw materials of elemental elements with a purity greater than 99.99% (Ge 1-x Cu 2x Te) 1-y (PbSe) y The stoichiometric ratio in the alloy is weighed for batching, and vacuum-packed in a quartz tube, where x=0.02, 0≤y≤0.25, and y is specifically selected as 0.05, 0.08, 0.1, 0.12, 0.15, 0.18, 0.2, 0.22, 0.25;
[0073] (2) Hang the quartz tube containing the raw materials in a vertical high-temperature furnace, slowly raise the temperature to 900-1000°C at a rate of 150-200°C per hour, keep it warm for 8-10 hours, and then quickly quench and cool to obtain the first ingot (i.e. melting ingot); in this step of this embodiment, the temperature is slowly raised to 950° C. at a rate of 200° C. per hour, and kept at 950° C. for 8 hours.
[0074] (3)...
Embodiment 2
[0099] Compared with Example 1, most of them are the same, except that in step (2) of this example, the temperature is slowly raised to 900° C. at a rate of 150° C. per hour and kept for 8 hours.
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