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A kind of high-performance europium-doped PBTE-based thermoelectric material and preparation method thereof
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A thermoelectric material and high-performance technology, which is applied in the direction of thermoelectric device junction lead-out material, thermoelectric device manufacturing/processing, etc. The effect of optimizing the energy band structure and improving the power factor
Active Publication Date: 2020-10-02
TONGJI UNIV
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[0033] In one embodiment of the present invention, a method for preparing a high-performance europium-doped PbTe-based thermoelectric material comprises the following steps:
[0034] (1) Vacuum packaging: take the elemental raw materials Na, Eu, Sn, Pb and Te according to the stoichiometric ratio, mix them evenly, and vacuum-pack them in a quartz tube;
[0035] (2) Melting reaction quenching: heating the quartz tube to make the raw materials fully react in the molten state, and then quenching to obtain the first ingot;
[0036] (3) heat treatment and quenching: the first ingot is vacuum-packed in another quartz tube, quenched and cooled after heat treatment to obtain the second ingot;
[0038] In a preferred embodiment of the present invention, the purity of Na, Eu, Sn, Pb and ...
Embodiment 1
[0044] A high-performance europium-doped PbTe-based thermoelectric material whose chemical formula is Na 0.02 Eu 0.03 sn x Pb 0.95-x Te, where x=0.01-0.025. In this embodiment, by taking x=0.01, 0.015, 0.02, and 0.025, according to the following preparation method, Na 0.02 Eu 0.03 sn x Pb 0.95-x Te bulk material:
[0045] (1) According to the value of different x, it becomes Na according to the composition 0.02 Eu 0.03 sn x Pb 0.95-x The stoichiometric ratio of Te (x=0.01~0.025) 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 .
[0046] (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; this implementation In thi...
Embodiment 2
[0058] 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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Abstract
The invention relates to a high-performance europium-doped PbTe-based thermoelectric material and a preparation method thereof. The chemical formula of the thermoelectric material is Na 0.02 Eu 0.03 sn x Pb 0.95‑x Te, x=0.01~0.025; the preparation method of the thermoelectric material uses high-purity elemental elements as raw materials, mixes ingredients according to the stoichiometric ratio of the chemical formula, and grinds them into powder after vacuum packaging, melting reaction quenching and heat treatment quenching, Vacuum high-temperature hot-press sintering, and the bulk material obtained after slow cooling is the thermoelectric material. Compared with the prior art, the present invention has produced a thermoelectric material with low thermal conductivity and high performance, and explored a method for preparing a thermoelectric material with high density, high mechanical strength and high thermoelectric performance. The thermoelectric material reaches the thermoelectric peak at a temperature of 800K zT ~ 2.2, is a class of high-performance thermoelectric materials with great potential.
Description
technical field [0001] The invention relates to the technical field of new energy materials, in particular to a high-performance europium-doped PbTe-based thermoelectric material and a preparation method thereof. Background technique [0002] With the rapid development of the global economy, the contradiction that the economy is constrained by resources and the environment is approaching the critical point. However, people's demand for environmental quality continues to rise. Under this background, energy saving and environmental protection have become two major themes in the world. As a new type of environmentally friendly energy material, thermoelectric materials can realize the direct conversion of heat and electricity by using the thermoelectric effect, so they play an important role in key fields such as waste heatrecovery and aerospace, and are a type of clean, carbon-free and sustainable energy technology. . [0003] The conversion efficiency of thermoelectric mate...
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