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| 1 | Synergistic optimization of electrical and thermal transport in n-type Bi-doped PbTe by introducing coherent nanophase Cu1-75Te显示文摘Based on the calculated results of band structures and density of states,Bi doping is used to adjust its carrier concentration in order to obtain n-type PbTe materials with high power factor.Then,coherent nanophase Cu1.75Te is in situ formed in the n-type PbTe matrix,which can simultaneously optimize the thermal and electrical properties.As a result,at a relative lower temperature than other reports,the highest ZT value of 1.4 is obtained at 623 K for the nominal Pb0995Bi0005Te+0.86 wt%Cu175Te sample.More importantly,the ZT hold a higher value in the broad temperature;especially,ZT value is about 1.2-1.4 in the temperature range of 573-773 K,which is beneficial to the significant average ZT value ZTave~0.9 in the temperature range of 300-773 K.These results indicate that it is an effective and feasible method to enhance the thermoelectric properties via synergistic modulation of electrical and thermal transport properties by element doping and in situ coherent nanophase. | Chen Zhu Jian Zhang Hongwei Ming Lulu Huang Yuanyue Li Tao Chen Di Li Baoli Zhang Jingtao Xu Xiaoying Qin | 2021 | Journal of Materiomics2021，7，1： | 0 |
| 2 | SiGe合金综述:最新的研究进展及热电性能优化策略显示文摘硅锗(SiGe)合金作为代表性中高温热电材料,在太空探测航天器的辅助电源上,已经获得了较为广泛的应用。SiGe合金具备结构稳定、元素丰富、无毒、耐高温、易于工业集成等显著优势,但较低的热电性能限制了SiGe合金的实际应用与推广。基于此,本文综述了SiGe基热电材料在电、热两方面的协同优化策略,以及相关最新研究进展。在电学方面,揭示了调制掺杂、能量过滤机制等优化策略对提高SiGe合金的功率因子的重要性;在热学方面,详细回顾了降低SiGe合金晶格热导率的诸多策略,包括纳米结构化、SiGe-金属硅化物/硅化物复合以及SiGe-氧化物复合策略,并比较了不同优化策略对晶格热导率的降低效果。通过电热输运参数的协同优化,p型和n型SiGe基热电材料的zT值分别达到了1.81(1100K)和1.7(1173K),为当前文献报道的最高值。本文对于SiGe块体材料的热电性能的进一步优化提供了一定的参考。 | 余锦 赖华俊 施润泽 彭英 苗蕾 | 2023 | 现代技术陶瓷2023，44，5： | 0 |
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