Sulfur-group lead-compound thermoelectric material and preparation method thereof
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A thermoelectric material and lead compound technology, applied in the field of chalcogenide lead compound thermoelectric material and its preparation, can solve problems such as inapplicability, and achieve the effect of simple method
Inactive Publication Date: 2017-05-24
TONGJI UNIV
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Problems solved by technology
However, due to the inherent brittleness of semiconductors, the current mature dislocation formation methods such as plastic deformation are not suitable for traditional thermoelectric semiconductors.
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preparation example Construction
[0040] A preparation method of a chalcogenide lead compound thermoelectric material, comprising the following steps:
[0041](1) Vacuum packaging: the elemental elements Pb, Sb, and Se with a purity greater than 99.99% are used according to the chemical formula Pb 1-x Sb 2x / 3 Se, 0
[0042] (2) Melting quenching: Put the quartz tube with raw materials into the pit furnace and raise the temperature of the quartz tube from room temperature to 1100-1150 °C at a rate of 150-200 °C per hour and keep it warm for 6 hours to make the raw material in a molten state Fully reacted, then quenched to obtain ingots;
[0043] (3) Annealing and quenching: the ingot obtained in (2) is re-vacuum-packed in a quartz tube, and put into a well-type furnace to raise the temperature of the quartz tube from room temperature to 700-800 ° C at a rate of 150-200 ° C per hour. Heat preservation for 2 to 4 days, heat ...
Embodiment 1
[0048] A kind of lead chalcogenide thermoelectric material, its chemical formula is Pb 1-x Sb 2x / 3 Se, x=0.01~0.07, in this embodiment by taking x=0.01, 0.03, 0.04, 0.05 and 0.07 (when x=0, the chemical formula is PbSe, when x=0.01, 0.03, 0.04, 0.05 and 0.07, That is, the dislocation concentration is optimized by doping different concentrations of Sb), and Pb with different dislocation concentrations is obtained according to the following preparation method 1-x Sb 2x / 3 Se bulk material:
[0049] (1) According to different x values, according to the chemical formula, it is Pb 1-x Sb 2x / 3 Stoichiometric ratio of Se (x=0.01-0.07) Weigh elemental raw materials lead Pb, antimony Sb, and selenium Se with a purity greater than 99.99%, place the raw materials in a quartz tube, and seal the quartz tube under vacuum.
[0050] (2) Hang the quartz tube containing the raw materials in a high-temperature well-type furnace. In this step of this embodiment, the temperature is slowly rais...
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Abstract
The invention relates to a sulfur-group lead-compound thermoelectric material and a preparation method thereof. The chemical formula of the sulfur-group lead-compound thermoelectric material is Pb(1-x)Sb(2x / 3)Se, wherein the x is larger than 0 and is less than 0.09. According to the preparation method, a high-purity simple substance is used as a raw material; batching is carried out based on a stoichiometric ratio in the chemical formula; after vacuum packaging, high-temperature melting, and annealing heat treatment are carried out, grinding is carried out to obtain powder; vacuum hot pressing sintering and slow cooling are carried out to obtain a sheet type block material that is a lead selenide material based on target components. A controllable preparation method of forming a dislocation structure by introducing a Pb positive ion vacancy structure is designed; and because a high-density transgranular dislocation structure is introduced into the material, intermediate-frequency phonons can be scattered effectively, so that the lattic thermal conductivity, less than 0.4W / m-K, of the material, can be reduced substantially. According to the prepared novel high-performance thermoelectric material based on Pb(1-x)Sb(2x / 3)Se, the zT value reaches 1.6 on the condition of 900K, wherein the zT value is a highest value of the existing PbSe system terminal. Therefore, the sulfur-group lead-compound thermoelectric material is a novel thermoelectric material with great large-scale application potential.
Description
technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a chalcogen lead compound thermoelectric material and a preparation method thereof. Background technique [0002] Due to the increasingly serious environmental pollution and energy crisis, the worldwide demand for clean and renewable energy is increasingly urgent, making the research on thermoelectric materials have attracted more and more researchers' attention. Based on the Seebeck effect or the Peltier effect, thermoelectric materials can be used as generators or coolers, respectively. Thermoelectric materials use the inherent carriers of the material as the working medium, and are noiseless, zero-emission, and environmentally friendly thermoelectric energy conversion materials. [0003] The conversion efficiency of thermoelectric materials is usually measured by the dimensionless thermoelectric figure of merit zT, zT=S 2 σT / κ, where: T is the absolu...
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