Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
P-type YbMg2Bi2-based thermoelectric material and preparation method thereof
The invention discloses a p-type YbMg2Bi2-based thermoelectric material and a preparation method thereof, and belongs to the field of new energy materials, the chemical general formula of the YbMg2Bi2-based thermoelectric material is YbMg2 + x-yCdyBi2, x is greater than 0 and less than 0.1, and y is greater than or equal to 0 and less than 0.4, the preparation method is characterized in that high-energy ball milling is combined with spark plasma sintering for preparation; the resoluble second phase is constructed by adjusting the content of Mg, and the carrier concentration of a high-temperature region is improved by adjusting the content of the second phase, so that the carrier concentration is close to an optimal carrier concentration interval, and a relatively high power factor is still obtained in the high-temperature region; on the other hand, the optimal carrier concentration is guaranteed, meanwhile, through Cd alloying, phonon scattering enhancement and lattice thermal conductivity reduction, the optimal carrier concentration is maintained, meanwhile, the lattice thermal conductivity is remarkably reduced, finally, the ZT value of the material is increased, and the highest ZT of the material is 0.8-1.0.
本发明公开了一种p型YbMg2Bi2基热电材料及其制备方法，属于新能源材料领域，所述YbMg2Bi2基热电材料的化学通式为YbMg2+x‑yCdyBi2，其中0＜x＜0.1，0≤y＜0.4，本发明的制备方法是采用高能球磨结合放电等离子烧结制备；本发明通过调整Mg含量来构建可回溶第二相，通过调节第二相含量来提高高温区的载流子浓度，使其接近最优载流子浓度区间，从而在高温区仍获得了较高的功率因子；另一方面，在保证最优载流子浓度的同时，通过Cd合金化，增强声子散射，降低晶格热导率，在维持一个最优载流子浓度的同时，显著降低晶格热导率，最终提高了材料的ZT值，材料的最高ZT在0.8~1.0。
P-type YbMg2Bi2-based thermoelectric material and preparation method thereof
The invention discloses a p-type YbMg2Bi2-based thermoelectric material and a preparation method thereof, and belongs to the field of new energy materials, the chemical general formula of the YbMg2Bi2-based thermoelectric material is YbMg2 + x-yCdyBi2, x is greater than 0 and less than 0.1, and y is greater than or equal to 0 and less than 0.4, the preparation method is characterized in that high-energy ball milling is combined with spark plasma sintering for preparation; the resoluble second phase is constructed by adjusting the content of Mg, and the carrier concentration of a high-temperature region is improved by adjusting the content of the second phase, so that the carrier concentration is close to an optimal carrier concentration interval, and a relatively high power factor is still obtained in the high-temperature region; on the other hand, the optimal carrier concentration is guaranteed, meanwhile, through Cd alloying, phonon scattering enhancement and lattice thermal conductivity reduction, the optimal carrier concentration is maintained, meanwhile, the lattice thermal conductivity is remarkably reduced, finally, the ZT value of the material is increased, and the highest ZT of the material is 0.8-1.0.
本发明公开了一种p型YbMg2Bi2基热电材料及其制备方法，属于新能源材料领域，所述YbMg2Bi2基热电材料的化学通式为YbMg2+x‑yCdyBi2，其中0＜x＜0.1，0≤y＜0.4，本发明的制备方法是采用高能球磨结合放电等离子烧结制备；本发明通过调整Mg含量来构建可回溶第二相，通过调节第二相含量来提高高温区的载流子浓度，使其接近最优载流子浓度区间，从而在高温区仍获得了较高的功率因子；另一方面，在保证最优载流子浓度的同时，通过Cd合金化，增强声子散射，降低晶格热导率，在维持一个最优载流子浓度的同时，显著降低晶格热导率，最终提高了材料的ZT值，材料的最高ZT在0.8~1.0。
P-type YbMg2Bi2-based thermoelectric material and preparation method thereof
一种p型YbMg2Bi2基热电材料及其制备方法
GUO MUCHUN (Autor:in) / LI JINBO (Autor:in) / YUAN DONGLIN (Autor:in) / ZHANG QINYONG (Autor:in)
29.10.2024
Patent
Elektronische Ressource
Chinesisch
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