El-Makaty Farah, Hamouda Abdel Magid, Abutaha Anas, Youssef Khaled
Mechanical and Industrial Engineering Department, Qatar University, Doha 2713, Qatar.
HBKU Core Labs, Hamad Bin Khalifa University, Doha 34110, Qatar.
Nanomaterials (Basel). 2024 Jan 25;14(3):260. doi: 10.3390/nano14030260.
Hot pressing represents a promising consolidation technique for ball-milled bismuth telluride alloys, yet deep investigations are needed to understand its effect on the thermoelectric properties. This paper studies the effect of hot-pressing parameters (temperature and pressure) on the thermoelectric properties of the n-type Gr-BiTeSe nanocomposite. Ultra-high pressure, up to 1.5 GPa, is considered for the first time for consolidating Bi(Te,Se) alloys. Results from this study show that increasing the temperature leads to changes in chemical composition and causes noticeable grain growth. On the contrary, increasing pressure mainly causes improvements in densification. Overall, increments in these two parameters improve the ZT values, with the temperature parameter having a higher influence. The highest ZT of 0.69 at 160 °C was obtained for the sample hot-pressed at 350 °C and 1 GPa for 5 min, which is indeed an excellent and competitive value when compared with results reported for this n-type BiTeSe composition.
热压是一种很有前景的用于球磨碲化铋合金的固结技术，但仍需要深入研究以了解其对热电性能的影响。本文研究了热压参数（温度和压力）对n型Gr-BiTeSe纳米复合材料热电性能的影响。首次考虑使用高达1.5 GPa的超高压来固结Bi(Te,Se)合金。该研究结果表明，温度升高会导致化学成分变化并引起明显的晶粒生长。相反，压力增加主要导致致密化程度提高。总体而言，这两个参数的增加都会提高ZT值，其中温度参数的影响更大。对于在350 °C和1 GPa下热压5分钟的样品，在160 °C时获得了最高ZT值0.69，与该n型BiTeSe成分报道的结果相比，这确实是一个优异且具有竞争力的值。
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