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• W3199886350 endingPage "2104067" @default.
• W3199886350 startingPage "2104067" @default.
• W3199886350 abstract "Powder metallurgy introduces small structures of high-density grain boundaries into Bi2 Te3 -based alloys, which promises to enhance their mechanical and thermoelectric performance. However, due to the strong donor-like effect induced by the increased surface, Te vacancies form in the powder-metallurgy process. Hence, the as-sintered n-type Bi2 Te3 -based alloys show a lower figure of merit (ZT) value than their p-type counterparts and the commercial zone-melted (ZM) ingots. Here, boron is added to one-step-sintered n-type Bi2 Te3 -based alloys to inhibit grain growth and to suppress the donor-like effect, simultaneously improving the mechanical and thermoelectric (TE) performance. Due to the alleviated donor-like effect and the carrier mobility maintained in our n-type Bi2 Te2.7 Se0.3 alloys upon the addition of boron, the maximum and average ZT values within 298-473 K can be enhanced to 1.03 and 0.91, respectively, which are even slightly higher than that of n-type ZM ingots. Moreover, the addition of boron greatly improves the mechanical strength such as Vickers hardness and compressive strength due to the synergetic effects of Hall-Petch grain-boundary strengthening and boron dispersion strengthening. This facile and cost-effective grain boundary engineering by adding boron facilitates the practical application of Bi2 Te3 -based alloys and can also be popularized in other thermoelectric materials." @default.
• W3199886350 created "2021-09-27" @default.
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• W3199886350 date "2021-09-19" @default.
• W3199886350 modified "2023-10-16" @default.
• W3199886350 title "Boron‐Mediated Grain Boundary Engineering Enables Simultaneous Improvement of Thermoelectric and Mechanical Properties in N‐Type Bi ₂ Te ₃" @default.
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• W3199886350 doi "https://doi.org/10.1002/smll.202104067" @default.
• W3199886350 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34541782" @default.
• W3199886350 hasPublicationYear "2021" @default.
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