Thermoelectric properties of Ag-doped n-type (Bi{sub 2}Te{sub 3}){sub 0.9}-(Bi{sub 2-} {sub x} Ag {sub x} Se{sub 3}){sub 0.1} (x=0-0.4) alloys prepared by spark plasma sintering

Journal Article · Thu Mar 15 00:00:00 EDT 2007 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2006.12.010· OSTI ID:21015759

Xiu, W J ^[1]; Mao, L D ^[1]; Ying, P Z ^[2]; Jiang, L ^[2]; Qian, X ^[3]

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1. School of Mechanical Engineering, Ningbo University of Technology, Ningbo 315016 (China)
2. School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221008 (China)
3. College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310014 (China)

Ag-doped n-type (Bi{sub 2}Te{sub 3}){sub 0.9}-(Bi{sub 2-} {sub x} Ag {sub x} Se{sub 3}){sub 0.1} (x=0-0.4) alloys were prepared by spark plasma sintering and their physical properties evaluated. When at low Ag content (x=0.05), the temperature dependence of the lattice thermal conductivity follows the trend of (Bi{sub 2}Te{sub 3}){sub 0.9}-(Bi{sub 2}Se{sub 3}){sub 0.1}; while at higher Ag content, a relatively rapid reduction above 400 K can be observed due possibly to the enhancement of scattering of phonons by the increased defects. The Seebeck coefficient increases with Ag content, with some loss of electrical conductivity, but the maximum dimensionless figure of merit ZT can be obtained to be 0.86 for the alloy with x=0.4 at 505 K, about 0.2 higher than that of the alloy (Bi{sub 2}Te{sub 3}){sub 0.9}-(Bi{sub 2}Se{sub 3}){sub 0.1} without Ag-doping. - Graphical abstract: The temperature dependence of dimensionless thermoelectric figure of merit ZT for different (Bi{sub 2}Te{sub 3}){sub 0.9}-(Bi{sub 2-} {sub x} Ag {sub x} Se{sub 3}){sub 0.1} (x=0-0.4) alloys prepared by spark plasma sintering.

• OSTI ID: 21015759
• Journal Information: Journal of Solid State Chemistry, Vol. 180, Issue 3; Other Information: DOI: 10.1016/j.jssc.2006.12.010; PII: S0022-4596(06)00649-9; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BISMUTH ALLOYS
CRYSTAL DEFECTS
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
PLASMA
SELENIUM ALLOYS
SILVER ALLOYS
SINTERING
TELLURIUM ALLOYS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0400-1000 K
THERMAL CONDUCTIVITY
THERMOELECTRIC PROPERTIES