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A-Site Deficient SrTiO3: A Possible Phonon-Glass Electron-Crystal?

Published online by Cambridge University Press:  06 June 2016

Srinivasa R. Popuri  and
Jan-Willem G. Bos
Srinivasa R. Popuri*
Affiliation:
Institute of Chemical Sciences and Centre for Advanced Energy Storage and Recovery, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, [email protected]
Jan-Willem G. Bos
Affiliation:
Institute of Chemical Sciences and Centre for Advanced Energy Storage and Recovery, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, [email protected]
*
*(Email: [email protected])
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Abstract

The thermoelectric properties of polycrystalline samples of Sr1-xLa0.67xTiO3-δ and Sr0.20La0.53Ti1−yNbyO3-δ have been investigated. The first series has a gradually increasing amount of A-site vacancies, and charge carriers linked to the oxygen deficiency. The second series has a fixed amount of A-site vacancies (27%) and variation of the Nb content was used to optimise the electrical properties. Maximum power factors of 0.6 mW m-1 K-2 for x = 0.4 and 0.4 mW m-1 K-2 for y = 0.05 were observed at 700 K. Combining these values with thermal conductivity data obtained previously, suggests that maximum figures of merit zT = 0.16 for x = 0.4 and zT = 0.2 for y = 0.05 are possible at 1000 K. This study contributes new insight on the interplay between A-site vacancies and thermoelectric performance in SrTiO3.

Keywords

thermoelectricelectrical propertiesoxide
Type
Articles
Information
MRS Advances , Volume 1 , Issue 60: Energy and Sustainability , 2016 , pp. 3997 - 4002
Copyright
Copyright © Materials Research Society 2016 

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