High-performance PbTe-based solid solution thermalelectric material and preparation method thereof
A thermoelectric material and solid solution technology, applied in the directions of metal selenide/telluride, binary selenium/tellurium compound, etc., can solve problems such as difficulty in meeting thermoelectric materials, and achieve reduced lattice thermal conductivity, high power factor, high mechanical the effect of strength
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[0037] In one embodiment of the present invention, a new preparation method different from conventional high-performance PbTe-based solid solution thermoelectric materials includes the following steps:
[0038] (1) Vacuum packaging:
[0039] According to the stoichiometric ratio, the elemental raw materials Na, Eu, Sn, Pb and Te were weighed, mixed evenly and vacuum-packed in a quartz tube;
[0040] (2) Melting reaction quenching:
[0041] Heating the quartz tube to make the raw materials fully react in the molten state, and then quenching to obtain the first ingot;
[0042] (3) Heat treatment quenching:
[0043] Vacuum-encapsulating the first ingot in another quartz tube, quenching and cooling after heat treatment, to obtain the second ingot;
[0044] (4) Pressure sintering:
[0045] Grinding the second ingot into powder, placing it in a graphite mold, sintering under vacuum and high temperature hot pressing, and cooling to obtain the target product.
[0046] In a prefer...
Embodiment 1
[0052] A high-performance PbTe-based solid solution thermoelectric material with the chemical formula Na x Eu 0.03 sn 0.02 Pb 0.95-x Te, where x=0.01-0.05. In this example, by taking x=0.01, 0.015, 0.02, 0.025, 0.03, 0.035, 0.04, 0.045 and 0.05, according to the following preparation method, Na x Eu 0.03 sn 0.02 Pb 0.95-x Te bulk material:
[0053] (1) According to the value of different x, it becomes Na according to the composition x Eu 0.03 sn 0.02 Pb 0.95-x The stoichiometric ratio of Te (x=0.01~0.05) Weigh the elemental raw materials sodium Na, europium Eu, tin Sn, lead Pb and tellurium Te with a purity greater than 99.9%, place the raw materials in a quartz tube, and seal the quartz tube under vacuum .
[0054] (2) Suspend the quartz tube containing the raw materials in a high-temperature muffle furnace, slowly raise the temperature to 1200-1400K at a rate of 150-300K / h, keep it warm for 6-10 hours, and then rapidly quench and cool to obtain the first ingot; t...
Embodiment 2
[0067] Compared with Example 1, most of them are the same, except that in step (2) of the present example: the temperature is slowly raised to 1300K at a rate of 150K / h, and the temperature is kept at 1300K for 10h.
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