Title:
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Crystallographically textured nanomaterials produced from the liquid phase sintering of BixSb₂-xTe₃ nanocrystal building blocks
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Author:
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Liu, Yu; Zhang, Yu; Ortega, Silvia; Ibáñez, Maria; Lim, Khak Ho; Grau Carbonell, Albert; Martí-Sánchez, Sara; Ng, Ka Ming; Arbiol i Cobos, Jordi; Kovalenko, Maksym V.; Cadavid, Doris; Cabot, Andreu
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Abstract:
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Bottom-up approaches for producing bulk nanomaterials have traditionally lacked control over the crystallographic alignment of nanograins. This limitation has prevented nanocrystal-based nanomaterials from achieving optimized performances in numerous applications. Here we demonstrate the production of nanostructured BixSb₂-xTe₃ alloys with controlled stoichiometry and crystallographic texture through proper selection of the starting building blocks and the adjustment of the nanocrystal-to-nanomaterial consolidation process. In particular, we hot pressed disk-shaped BixSb₂-xTe₃ nanocrystals and tellurium nanowires using multiple pressure and release steps at a temperature above the tellurium melting point. We explain the formation of the textured nanomaterials though a solution-reprecipitation mechanism under a uniaxial pressure. Additionally, we further demonstrate these alloys to reach unprecedented thermoelectric figures of merit, up to ZT = 1.96 at 420 K, with an average value of ZT = 1.77 for the record material in the temperature range 320-500 K, thus potentially allowing up to 60% higher energy conversion efficiencies than commercial materials. |
Subject(s):
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-Bulk nano-materials -Commercial materials -Consolidation process -Controlled stoichiometry -Crystallographic textures -Optimized performance -Tellurium nanowires -Uniaxial pressures |
Rights:
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open access
Tots els drets reservats.
https://rightsstatements.org/vocab/InC/1.0/ |
Document type:
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Article |
Published by:
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Share:
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Uri:
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https://ddd.uab.cat/record/215012
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