Tyagi, Kriti and Gahtori, Bhasker and Bathula, Sivaiah and Jayasimhadri, M. and Singh, NirajKumar and Sharma, Sakshi and Haranath, D. and Srivastava, A. K. and Dhar, Ajay (2015) Enhanced thermoelectric performance of spark plasma sintered copper-deficient nanostructured copper selenide. Journal of Physics and Chemistry of Solids, 81. pp. 100-105. ISSN 0022-3697

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Abstract

We report the thermoelectric properties of nanostructured Cu-deficient Cu2Se, which was synthesized by high energy ball milling followed by spark plasma sintering. Our method obtained a significant enhancement in the thermoelectric figure of merit (Zr), i.e., similar to 1.4 at 973 K, which was similar to 30% higher than its bulk counterpart. This enhancement in the thermoelectric performance was due mainly to a significant reduction in the lattice thermal conductivity, which was attributed to enhanced phonon scattering at various length scales by nanoscale defects as well as abundant nanograin boundaries. The nanoscale defects were characterized by transmission electron microscopy of the nanostructured Cu2-xSe samples, which formed the basis of the ZT enhancement.

Item Type:	Article
Uncontrolled Keywords:	Electron microscopy Microstructure Thermal conductivity Electrical properties Specific heat
Subjects:	Chemistry Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	23 Sep 2016 04:53
Last Modified:	23 Sep 2016 04:53
URI:	http://npl.csircentral.net/id/eprint/1810

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