Method for preparing elemental tellurium based composite pyroelectric material
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A thermoelectric material and elemental technology, which is applied in the manufacture/processing of thermoelectric devices, and the lead wire material of thermoelectric device junctions. , the effect of high power factor
Inactive Publication Date: 2020-01-17
TAIYUAN UNIV OF TECH
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Problems solved by technology
However, there are still relatively few studies on the thermal transport properties of Te, and the reduction of the lattice thermal conductivity of Te is still facing challenges. It is of great significance to prepare high-performance Te-based thermoelectric materials with low thermal conductivity through appropriate methods.
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[0041] The preparation method of elemental tellurium-based composite thermoelectric material in the present invention comprises the following steps:
[0042] (1) Te block, Sb powder and Se powder with a purity of not less than 99.99%, according to Te 1-x (Sb 2 Se 3 ) x Weigh each raw material component according to the mole fraction ratio in the formula, put it into a carbon-coated quartz tube and vacuumize it;
[0043] (2) Place the quartz tube filled with simple raw materials completed in step (1) in a vertical tube furnace for heating, and slowly raise the temperature to the melting temperature, so that the raw materials can fully react in the molten state, and then quenched in water to obtain the initial Ingot;
[0044] (3) The initial ingot obtained in step (2) is vacuum-encapsulated in a carbon-coated quartz tube again, placed in a vertical tube furnace, heated and annealed, then quenched to obtain an annealed ingot;
[0045] (4) Grinding the annealed ingot obtained...
Embodiment approach 1
[0053] In this embodiment, an elemental tellurium-based composite thermoelectric material whose general chemical formula is Te 1-x (Sb 2 Se 3 ) x , x are 0, 0.005, 0.02, 0.03, 0.05, 0.1 and 0.15 respectively, that is, in this embodiment, a single tellurium-based composite thermoelectric material has the chemical formulas of Te, Te 0.995 (Sb 2 Se 3 ) 0.005 、 Te 0.98 (Sb 2 Se 3 ) 0.02 、 Te 0.97 (Sb 2 Se 3 ) 0.03 、 Te 0.95 (Sb 2 Se 3 ) 0.05 、 Te 0.9 (Sb 2 Se 3 ) 0.1 and Te 0.85 (Sb 2 Se 3 ) 0.15 a series of materials.
[0054] In this embodiment, a specific preparation method of an elemental tellurium-based composite thermoelectric material is as follows:
[0055] (1) In a glove box filled with an argon atmosphere, put Te block, Sb powder and Se powder with a purity of not less than 99.99%, according to the general chemical formula Te 1-x (Sb 2 Se 3 ) x The mole fraction proportioning weighs each raw material component (total mass is 8 grams), packs ...
Embodiment approach 2
[0066] This embodiment is basically the same as Embodiment 1, and the special feature is that the value of x in this embodiment is 0.2.
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Abstract
The invention relates to a method for preparing an elemental tellurium based composite pyroelectric material and belongs to the field of pyroelectric materials. The pyroelectric material is characterized by having a chemical formula of Te1-x(Sb2Se3)x, wherein x is not smaller than 0 and not greater than 0.2. The preparation method disclosed by the invention comprises the following steps: weighingvarious raw material ingredients according to a mole fraction proportioning ratio of the chemical formula, and encapsulating Te cakes, Sb powder and Se powder into a carbon-plated quartz tube throughvacuum encapsulation; then, smelting the quartz tube in a vertical tube type furnace; then, carrying out annealing treatment; and finally, grinding an obtained cast ingot into fine powder, then, carrying out spark plasma sintering, so as to obtain dense mass which has very low thermal conductivity and relatively high pyroelectric properties, wherein the pyroelectric Q-value reaches 0.95. Accordingto the method, the pyroelectric properties of the elemental tellurium based composite pyroelectric material are improved through a smelting process, an annealing process and a spark plasma sinteringprocess. Compared with the prior art, the method has the advantages that through introducing an antimony selenide component, the cooperated optimization of carrier concentration and lattice thermal conductivity is achieved, and the process flow is simple and controllable and is low in cost.
Description
technical field [0001] The invention relates to a method for preparing a simple tellurium-based composite thermoelectric material, which belongs to the field of thermoelectric materials, and in particular relates to a method for optimizing the hole carrier concentration interval by regulating the content of Sb2Se3 components, and at the same time constructing a Te matrix containing zero-dimensional replacement sites Elemental tellurium-based composite thermoelectric material with a multidimensional defect structure of point defects, one-dimensional dislocations, two-dimensional grain boundaries and three-dimensional second phases and a preparation method thereof. Background technique [0002] Thermoelectric energy conversion materials, as a new energy material with no pollutant emissions, no transmission parts, no noise, and high reliability, can directly convert heat energy into electrical energy by using the directional movement of carriers inside a solid based on the Seebe...
Claims
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