Effect of Na and Ba co-doping on the structure and thermoelectric performance of PbTe0.5Se0.5

PbTe-based semiconductor thermoelectric materials are currently active areas of research. In this work, Na- and Ba-doped PbTe0.5Se0.5 alloys were prepared by vacuum melting and spark plasma sintering techniques. Na doping suppressed the transition of PbTe0.5Se0.5 from p-type to n-type conductivity a...

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Bibliographic Details
Published inScripta materialia Vol. 120; pp. 9 - 13
Main Authors Gui, Y.Q., Zheng, Y.S., Liu, F.S., Zhang, S.L., Ao, W.Q., Li, Y., Li, J.Q.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.07.2016
Subjects
Adjustment
Alloys
Doping
Electrical properties
Heat transfer
PbTe0.5Se0.5
Semiconductors
Spark plasma sintering
Thermal conductivity
Thermoelectric materials
Thermoelectricity
PbTe0.5Se0.5
Thermoelectric materials
Thermal conductivity
Spark plasma sintering
Electrical properties
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Summary:PbTe-based semiconductor thermoelectric materials are currently active areas of research. In this work, Na- and Ba-doped PbTe0.5Se0.5 alloys were prepared by vacuum melting and spark plasma sintering techniques. Na doping suppressed the transition of PbTe0.5Se0.5 from p-type to n-type conductivity and adjusted the carrier concentration. In the case of Na0.02(BaxPb1−x)0.98Te0.5Se0.5, doping with Ba increased the Seebeck coefficient, decreased the thermal conductivity, and improved the thermoelectric performance compared to those of the undoped material. A high figure of merit (ZT) value of 1.17 at 723K was obtained for Na0.02(Ba0.06Pb0.94)0.98Te0.5Se0.5, which is approximately 22% greater than that of the undoped sample. [Display omitted]
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2016.04.009