通过机械合金化法获得Bi0.85Sb0.15纳米晶粉末材料,在常温下冷压成型并分别在不同温度下进行高压处理,制备出块状样品.X-ray衍射实验证实已形成了Bi0.85Sb0.15单相合金.测量了样品在80～300 K温区的Seebeck系数和电导率,计算出材料的功率因子与温度的关系.在523 K 6 GPa下压制30 min的样品,其Seebeck系数在150 K达到-173μV/K,比同温度下单晶材料样品的Seebeck高大约60%,功率因子在200 K达到3.27×10-3 W/m·K2,表明高压处理可以有效改善材料热电性能.高分辨电镜分析发现材料中存在均匀分布的小于5 nm的"纳米点","纳米点"的存在导致材料Seebeck系数在低温显著提高.
参考文献
| [1] | T.M.Tritt,Thermoelectrics run hot and cold,Science,272(5266),1276(1996) |
| [2] | H.J.Goldsmid,G.S.Nolas,A Review of the new thermoelectric materials,Proc.of 20th Inter.Conf.on Thermoelectrics,edited by J.G.Chen,IEEE Inc,Beijing,1(2001) |
| [3] | D.M.Rowe,CRC Handbook of Thermoelectrics,(New York,CRC Press,1995) p.157 |
| [4] | B.C.Sales,D.Mandrus,R.K.Williams,Filled skutterudite antimonides:a new class of thermoelectric materials,Science,272(5266),1325(1996) |
| [5] | T.M.Tritt,thermoelectric material:holey and unholey semiconductors,Science,283(5403),804(1999) |
| [6] | D.Y.Chung,T.Hogan,P.Brazis,R.L.Melissa,C.Kannewurf,M.Bastea,C.Uher,M.G.Kana-tzidis,CsBi4Te6:A high-performance thermoelectric material for low-temperature applications,Science,287(5455),1024(2000) |
| [7] | G.A.Slack,V.G.Tsoukala,Some properties of semiconducting IrSb3,J.Appl.Phys.,76(3),1665(1994) |
| [8] | J.L.Cohn,G.S.Nolas,V.Fessatidis,T.H.Metcalf,G.A.Slack,Glass like heat conduction in high-mobility crystalline semiconductors,Phys.Rew.Lett.,82(4),779(1999) |
| [9] | R.Venkatasubr amanian,E.Siivola,T.Colpitts,B.O′Quinn,Thin-film thermoelectric devices with high room-temperature figures of merit,Nature,413(6856),597(2001) |
| [10] | V.S.Zemskov,A.D.Belaya,U.S.Beluy,G.N.Kozhemyakin,Growth and investigation of thermoelectric properties of Bi-Sb alloy single crystals,Journal of Crystal Growth,212(1～2),161(2000) |
| [11] | W.M.Yim,A.Amith,Bi-Sb alloys for magentothermoelectric and thermomagnetic cooling,Solid State Electronics,15(10),1141(1972) |
| [12] | N.V.C.Shekar,D.A.Polvani,J.F.Meng,J.V.Badding,Improved thermoelectric properties due to electronic topological transition under high pressure,Physica B:Condensed Matter.,358(1～4),14(2005) |
| [13] | D.A.Polvani,J.F.Meng,N.V.Chandra Shekar,J.Sharp,J.V.Badding,Large improvement in thermoelectric properties in pressure-tuned p-type Sb1.5Bi0.5Te3,Chem.Mater.,13(6),2068(2001) |
| [14] | B.Lenoir,M.Cassart,J.P.Michenaud,H.Scherrer,Transport properties of Bi-rich Bi-Sb alloys,J.Phys.Chem.Solid.,57(1),89(1996) |
| [15] | Y.Nishio,T.Hirano,Methods of improving the efficiency of thermoelectric energy conversion and characteristic energy range of carriers,Jpn.Appl.Phys.,36(8),170(1997) |
| [16] | ZHU Pinwen,JIA Xiaopeng,CHEN Haiyong,CHEN Lixue,LI Dongmei,GUO Weili,MA Honggan,REN Guozhong,ZOU Guangtian,PbTe syntheses by highpressure and high-temperature approach,High Pressure Phys.,16,183(2002)(朱品文,贾晓鹏,陈海勇,陈立学,李冬妹,郭伟力,马红安,任国仲,邹广田,PbTe的高温高压合成,高压物理学报,16,183(2002)) |
| [17] | K.Park,J.H.Seo,D.C.Cho,B.H.Choi,C.H.Lee,Thermoelectric properties of p-type Te doped Bi0.5Sb1.5Te3 fabricated by powder extrusion,Mater.Sci.Eng.B,88(14),103(2002) |
| [18] | J.Seo,K.Park,D.Lee,C.Lee,Thermoelectric properties of hot-pressed n-type Bi2Te2.85Se0.15 compounds doped with SbI3,Mater.Sci.Eng.B,49,247(1997) |
| [19] | Z.M.Sun,H.Hashimoto,N.Keawprak,A.B.Ma,L.F.Li,M.W.Barsoum,Effect of rotary-die equal channel angular pressing on the thermoelectric properties of a (Bi,Sb)2Te3alloy,Journal of Materials Research,20(4),859(2005) |
| [20] | K.Uemura,I.Nishida,Thermoelectric Semiconductors and Their Applications,(Tokyo Nikkan-Kogyo Shinbun Press,1988),p.145 |
| [21] | HU Shuhong,ZHAO Xinbing,ZHU Tiejun,Mn15Bi34Te51and La15Bi34Te51 thermoelectric materials by mechanical alloying,Rare Metal Mater.and Eng.,31,287 (2002)(胡淑红,赵新兵,朱铁军,机械合金化法制备的Mn15Bi34Te51和La15Bi34Te51热电材料,稀有金属材料工程,31,287(2002)) |
| [22] | K.F.Hsu,S.Loo,F.Guo,W.Chen,J.S.Dyck,C.Uher,T.Hogan,E.K.Polychroniadis,M.G.Kanatzidis,Cubic AgPbmSbTe2+m:bulk thermoelectric materials with highfigure of merit,Science,303(5659),818(2004) |
| [23] | H.Wang.J.F.Li,C.W.Nan,M.Zhou,High-performance Ag()Pb18+xSbTe20 thermoelectric bulk materials fabricated by mechanical alloying and spark plasma sintering,Appl.Phys.Lett.,88(9),405(2006) |
| [24] | J.P.Heremans,C.M.Thrush,D.T.Morelli,Thermopower enhancement in PbTe with Pb precipitates,Journal of Applied Physics,98(6),063703(2005) |
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