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The effect of heat treatment on the thermoelectric properties of n and p-type SiGe alloys prepared by vacuum hot-pressing
許文豪, Wen-Hau Shiu
|關鍵字:||Si80Ge20;Si80Ge20;thermoelectric material;figure of merit;vacuum hot-pressing;vacuum arc melting;熱電材料;熱電優值;真空熱壓法;真空電弧熔煉||出版社:||材料科學與工程學系所||引用:||1. S. Jacobsson, and A. Johnson, “The diffusion of renewable energy technology: an analytical framework and key issues for research,” Energy Policy, 28 (2000) 625. 2. T. J. Seebeck, “Magnetic polarization of metals and minerals,” Abhandlungen der Deutschen Akademie der Wissenschaften zu Berlin, 265 (1823). 3. A. F. Ioffe, S. V. Airapetyants, A. V. Ioffe, N. V. Kolomoets, and L. S. Stilbans, “On increasing the efficiency of semiconducting thermocouples,” Dokl. Akad. Nauk SSSR, 106 (1956) 931. 4. H. J. Goldsmid, and R. W. Douglas, “The use of semiconductors in thermoelectric refrigeration,” Br. J. Appl. Phys., 5 (1954) 386. 5. T. M. Tritt, and M. A. Subramanian, “Thermoelectric materials, phenomena and applications: A bird’s eye view,” MRS bulletin, 31 (2006). 6. C. E. Kelly, “The MHW converter (RTG),” 10th Int. 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In this study, both n- and p-type Si80Ge20 thermoelectric alloys were prepared by vacuum arc melting of corresponding ingots with gallium phosphide and boron, respectively. These n- and p-type Si80Ge20 alloys were ground into the fine powder by planetary ball milling, the dense bodies were sintered at 1373K for 3 hours by vacuum hot-pressing and then heat treated at 1523K for various times in air atmosphere. The effects of heat treatments with various times on the thermoelectric properties of SiGe alloys were studies.
From XRD analysis, the as-hot-pressed samples contain the sole SiGe phase structure. The heat treatment process causes grain growth and promote sintered density in air, also produced SiO2 phase as well. It is shown by FE-SEM that the amount of pores obviously reduces with increasing heat treatment time. ICP-MS and EA quantitative analyses show that the Si80Ge20 alloys made by powder metallurgy could reduce the non-uniformity of composition.
The results of thermoelectric property measurement show that the heat treatment in air increases the carrier concentration and the electrical conductivity. The increase of SiO2 results in more phonon scattering in the lattice structure and hence reduces the thermal conductivity. The optimum paramerers of heat treatment for n-type Si80Ge20 alloys are 1523 K for 15 hours. At this condition the optimal figure of merit is 0.09 at 573 K. The optimum paramerers for p-type Si80Ge20 alloys are 1523 K for 6 hours at which the optimal figure of merit is 0.016 at 523 K.
本實驗利用真空電弧熔煉法分別製備摻雜 GaP 與 B 之N 型與 P 型 Si80Ge20 合金熱電材料，並以行星式球磨法獲得合適粒徑的粉體，再將粉體藉由1373K真空熱壓3小時與在空氣中進行1523K不同時間後熱處理來獲得緻密之合金塊材，本研究探討改變熱處理時間對 Si80Ge20 合金之熱電特性的影響。
由熱電特性量測結果中發現，經過空氣中熱處理後可增加載子濃度，使得導電率增加。而SiO2 的增加亦造成晶格中的聲子散射增加並減少熱傳導率。N型Si80Ge20合金之最佳熱電優值出現在1523 K熱處理15小時，量測溫度為573 K，其值為0.09。而P型SiGe合金之最佳熱電優值則出現在1523 K熱處理6小時，量測溫度為523 K，其值為0.016。
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