以单质Bi,Sb和Te粉末为原材料,通过真空电弧等离子体蒸发法合成了(Bi<,x>Sb<,1-x>)<,2>Te<,3>热电粉末材料.采用X射线衍射(XRD)、能谱分析(EDS),场发射扫描电子显微术(FE-SEM),透射电子显微术(TEM)和选区电子衍射(SAED)分析方法对(Bi<,x>Sb<,1-x>)<,2>Te<,3>粉末材料的物相结构、成分和形貌进行了表征.XRD图谱的3强衍射峰分别为(015),(1010)和(110),(Bi<,x>Sb<,1-x>)<,2>Te<,3>纳米粉末的XRD图谱与标准XPD图谱峰(49-1713)相对应,宽化的衍射峰表明了粉末的晶粒具有纳米尺度.能谱定量分析表明Bi和Sb的原子百分比分别为18.1%,20.3%,两者原子百分比之和为38.4%,Te的原子百分比是61.6%.场发射扫描电子显微分析表明纳米粉末颗粒尺寸比较均匀,粉末存在团聚现象,大多数粉末都呈椭球形.透射电子显微分析表明(Bi<,x>Sb<,1-x>)<,2>Te<,3>纳米粉末的平均粒径约为50 mm,粉末呈不规则的多面体结构,还有一些薄片状和棒状的结构,这与Bi<,2>Te<,3>基半导体化合物的高度各向异性是一致的.(Bi<,x>Sb<,1-x>)<,2>Te<,3>纳米粉末的选区电子衍射图表明每一个颗粒是由许多小晶核组成的,证明了颗粒是以纳米尺度生长.由于晶粒取向随机,且晶粒细小引起有许多衍射斑组成的衍射环的宽化,揭示了(Bi<,x>Sb<,1-x>)<,2>Te<,3>纳米粉末的多晶结构.
参考文献
| [1] | Lon E. Bell .Cooling, Heating, Generating Power, and Recovering Waste Heat with Thermoelectric Systems[J].Science,2008(5895):1457-1461. |
| [2] | David J. Singh;Ichiro Terasaki .Nanostructuring and more[J].Nature materials,2008(8):616-617. |
| [3] | Fan XA;Yang J Y;Zhu W;Bao S Q,Duan X K,Xiao C J,Li K .Preferential orientation and thermoelectric properties of ptype Bi《,0.4》Sb《,1.6》Te《,3》 system alloys by mechanical alloying and equal channel angular extrusion[J].Journal of Alloys and Compounds,2008,461(1-2):9. |
| [4] | L.D. Zhao;B.-P. Zhang;J.-F. Li .Enhanced thermoelectric and mechanical properties in textured n-type Bi_2Te_3 prepared by spark plasma sintering[J].Solid state sciences,2008(5):651-658. |
| [5] | Fan Xi'an;Yang Junyou;Zhu Wen;Bao Siqian Duan Xingkai Zhang Qinqin .Thermoelectric properties of p-type Te-doped (Bi,Sb)《,2》Te《,3》 alloys by mechanical alloying and plasma activated sintering[J].Journal of Alloys and Compounds,2008,448(1-2):308. |
| [6] | 魏少红,王忠,陈晖,褚颖.急冷甩带对Bi2Te2.7Se0.3热电材料微观结构与电性能的影响[J].稀有金属,2009(04):534-537. |
| [7] | Xu Yongbin;Ren Zhongming;Ren Weili;Deng Kang Zhong Yunbo .Aqueous chemical synthesis of nanoscale Bi《,2》(Te,Se)《,3》 and(Bi,Sb)《,2》Te《,3》 thermoelectric compounds[J].Materials Letters,2008,62(4-5):763. |
| [8] | Takashiri M;Tanaka S;Takiishi M;Kihara M,Miyazaki K,Tsukamoto H .Preparation and characterization of Bi《,0.4》 Te《,3.0》 Sb《,1.6》 nanoparticles and their thin films[J].Journal of Alloys and Compounds,2008,462(1-2):351. |
| [9] | Weili Ren;Chunxia Cheng;Yongbin Xu;Zhongming Ren;Yunbo Zhong .Surfactant-assisted solvothermal synthesis of single-crystalline ternary Bi-Sb-Te hexagonal nanoplates[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2010(1):120-123. |
| [10] | 赵新兵,曹一琦,朱铁军.纳米结构Bi2Te3基热电材料的溶剂热合成[J].材料研究学报,2006(04):337-345. |
| [11] | 褚颖,王忠,魏少红,刘娟,蒋利军.溶剂热法制备花簇状纳米Bi2Te3化合物的研究[J].稀有金属,2009(05):754-757. |
| [12] | Cao Y Q;Zhu T J;Zhao X B .Thermoelectric Bi《,2》Te《,3》 nanotubes synthesized by low-temperature aqueous chemical method[J].Journal of Alloys and Compounds,2008,449(1-2):109. |
| [13] | Feng Xiao;Carlos Hangarter;Bongyoung Yoo;Youngwoo Rheem;Kyu-Hwan Lee;Nosang V. Myung .Recent progress in electrodeposition of thermoelectric thin films and nanostructures[J].Electrochimica Acta,2008(28):8103-8117. |
| [14] | 颜秀文,丘泰,李良峰,张振忠.纳米Ag-Cu-In-Sn合金粉末的制备及其热分析[J].稀有金属材料与工程,2008(02):330-333. |
| [15] | J.Borysiuk;A.Grabias;J.Szczytko .Structure and magnetic properties of carbon encapsulated Fe nanoparticles obtained by arc plasma and combustion synthesis[J].Carbon: An International Journal Sponsored by the American Carbon Society,2008(13):1693-1701. |
| [16] | 杨江海,张振忠,赵芳霞,王超,安少华.直流电弧等离子体法制备铋纳米粉体[J].中国有色金属学报,2009(02):334-338. |
| [17] | Xingkai Duan;Junyou Yang;Wei Zhong .Synthesis of Bi2Te3 nanopowders by vacuum arc plasma evaporation[J].Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems,2007(2):63-66. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%