采用水热合成法结合放电等离子烧结技术制备了Ag2 S/Bi2 S3块体热电复合材料.采用XRD、SEM和TEM对合成粉末材料的相组成和微观形貌进行分析,闪光法和塞贝克系数/电阻测量系统测试复合块材的热电性能,系统地研究了Ag2 S的含量对Ag2 S/Bi2 S3复合材料热电性能的影响.实验结果表明,水热法成功地合成了具有球形结构的Ag2 S/Bi2 S3复合粉末；块体样品的塞贝克系数都为负,说明样品为 n型半导体；适量的 Ag2 S 复合Bi2 S3不仅有效地降低了材料的热导率,同时也提高了电导率；当Bi2 S3与3％的 Ag2 S复合时样品的热电优值(ZT 值)最大,其在724 K时的ZT 值为0．23,为纯Bi2 S3样品在该温度ZT 值的2．3倍.
Ag2 S/Bi2 S3 composite powders with spherical structure was synthesized successfully by hydrothermal method and then pressed into bulk by spark plasma sintering technique.The crystalline structure and morpholo-gy of the powder was determined by X-ray diffraction and scanning electron microscopy.The effect of Ag2 S con-tent on the Ag2 S/Bi2 S3 composite thermoelectric properties was investigated systematically.The thermoelectric performance results showed that the Seebeck coefficients of all the Ag2 S/Bi2 S3 samples were negative,which in-dicated that the composites were n-type semiconductors.Appropriate Ag2 S added in Bi2 S3 could not only reduce the thermal conductivity,but also enhanced the electrical conductivity.The maximal ZT of Bi2 S3 with 3% Ag2 S was 0.29 at 724 K,which is twice than that of the pure Bi2 S3 .
参考文献
| [1] | Lon E. Bell.Cooling, Heating, Generating Power, and Recovering Waste Heat with Thermoelectric Systems[J].Science,20085895(5895):1457-1461. |
| [2] | Liu WS;Zhang BP;Li JF;Zhang HL;Zhao LD.Enhanced thermoelectric properties in CoSb3-xTex alloys prepared by mechanical alloying and spark plasma sintering[J].Journal of Applied Physics,200710(10):103717-1-103717-7-0. |
| [3] | Bed Poudel;Qing Hao;Yi Ma;Yucheng Lan;Austin Minnich;Bo Yu;Xiao Yan;Dezhi Wang;Andrew Muto;Daryoosh Vashaee.High-Thermoelectric Performance of Nanostructured Bismuth Antimony Telluride Bulk Alloys[J].Science,20085876(5876):634-638. |
| [4] | Y. Q. Cao;X. B. Zhao;T. J. Zhu;X. B. Zhang;J. P. Tu.Syntheses and thermoelectric properties of Bi_(2)Te_(3)/Sb_(2)Te_(3) bulk nanocomposites with laminated nanostructure[J].Applied physics letters,200814(14):143106-1-143106-3-0. |
| [5] | Baoxing Chen;Ctirad Uher;Lykourgos Iordanidis.Transport properties of Bi_2S_3 and the ternary bismuth sulfides KBi_6.33S_10 and K_2Bi_8S_13[J].Chemistry of Materials,19977(7):1655-1658. |
| [6] | 朱启安;占凯;谭香;张琪;胡耐根;袁达辉.回流法制备菜花状、松果状和剑麻状硫化铋纳米材料及其表征[J].湘潭大学自然科学学报,2013(3):58-63. |
| [7] | Zhen-Hua Ge;Bo-Ping Zhang;Yong Liu.Nanostructured Bi_(2_x)Cu_xS3 bulk materials with enhanced thermoelectric performance[J].Physical chemistry chemical physics: PCCP,201213(13):4475-4481. |
| [8] | Zhang, L.-J.;Zhang, B.-P.;Ge, Z.-H.;Han, C.-G..Fabrication and properties of Bi_2S_(3-x)Se_x thermoelectric polycrystals[J].Solid State Communications,2013:48-52. |
| [9] | Xueli Du;Fengshi Cai;Xuewei Wang.Enhanced thermoelectric performance of chloride doped bismuth sulfide prepared by mechanical alloying and spark plasma sintering[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2014:6-9. |
| [10] | Zhen-Hua Ge;Bo-Ping Zhang;Yi-Qiang Yu.Fabrication and properties of Bi_(2-x)Ag_(3x)S_3 thermoelectric polycrystals[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2012:205-209. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%