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Applicant:
Indian Institute of Technology (IIT) Patna 
Author:
Ashutosh Kumar, Karuna Kumari, B. Jayachandran, D. Sivaprahsam, Ajay D. Thakur 
Corresponding Authors:
Ashutosh Kumar, Ajay D. Thakur 
DOI #:
https://doi.org/10.1016/j.jallcom.2018.03.347 
Title:
Thermoelectric properties of (1-x) LaCoO3. xLa0. 7Sr0. 3MnO3 composite 
Journal:
Journal of Alloys and Compounds 
Year:
2018 
Volume:
749 
Page:
1092 
Keywords:
Thermal conductivity, Electrical conductivity, Perovskites, Manganites, Cobaltate, Composite 
Abstract:
We report the thermoelectric (TE) properties of (1-x)LaCoO3.xLa0.7Sr0.3MnO3(0<x<0.50) composite ina temperature range 320e800K. Addition of La0.7Sr0.3MnO3to LaCoO3in small amount (5 weight %)improves the overall Seebeck coefficient (a) at higher temperatures. The electrical conductivity howeverdecreases due to a decrease in carrier concentration of the composite. The decrease in electrical con-ductivity of the composite at high temperature may be attributed to the insulating nature of the LSMOabove room temperature. Thermal conductivity (k) of all the samples increases with an increase in thetemperature, but decreases with increasing LSMO content. We also report the local variation of Seebeckcoefficient across the composite samples measured using a precision Seebeck measurement system. Amaximum value of 0.09 for thefigure of merit (ZT) is obtained for 0.95LaCoO3.0.05La0.7Sr0.3MnO3at620 K which is significantly higher than theZTof either of LaCoO3or La0.7Sr0.3MnO3at 620 K. Thissuggests the potential for enhancement of operating temperatures ofhithertowell known low temper-ature thermoelectric materials through suitable compositing approach 
Entered by:
Venkata Dantham on 2020-08-02 
 
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