There is evidence that magnetism can potentially increase the thermopower of materials, most likely due to magnon scattering, suggesting the incorporation of intrinsic magnetic semiconductors in non-magnetic thermoelectric materials. Here, samples of p-type Bi0.5Sb1.5Te3 with 10 at. % excess Te are ball-milled with varying ratios of the antiferromagnetic semiconductor CrSb (0, 0.125, 0.5, and 1 wt. %) to prepare bulk samples by spark plasma sintering technique. The thermopower of samples containing CrSb is increased due to an increase in the effective mass of the charge carriers, indicating that there is a drag effect originating from the magnetic particles. However, this was at the expense of reduced electrical conductivity caused by reduced charge carrier mobility. While overall only marginal improvements in power factors were observed, these samples exhibited significantly lower thermal conductivity compared to the single-phase material. As a result, a peak zT value of ∼1.4 was achieved at 325 K for the sample with 0.125 wt. % CrSb. These results highlight the potential of incorporating magnetic secondary phases to enhance the thermoelectric performance of materials.
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11 November 2024
Research Article|
November 12 2024
Enhanced thermoelectric performance of p-type BiSbTe through incorporation of magnetic CrSb
Raphael Fortulan
;
Raphael Fortulan
a)
(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Visualization, Writing – original draft, Writing – review & editing)
1
Materials and Engineering Research Institute, Sheffield Hallam University
, Sheffield, United Kingdom
a)Present address: Unconventional Computing Laboratory, University of the West of England, Bristol, United Kingdom. Author to whom correspondence should be addressed: [email protected]
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Suwei Li
;
Suwei Li
(Investigation, Validation, Writing – original draft)
2
School of Engineering and Material Science, Queen Mary University of London
, Mile End Road, London E1 4NS, United Kingdom
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Michael John Reece
;
Michael John Reece
(Writing – original draft)
2
School of Engineering and Material Science, Queen Mary University of London
, Mile End Road, London E1 4NS, United Kingdom
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Illia Serhiienko
;
Illia Serhiienko
(Investigation, Validation, Visualization, Writing – original draft)
3
International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science
, Tsukuba, Japan
4
Graduate School of Pure and Applied Science, University of Tsukuba
, Tsukuba, Japan
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Takao Mori
;
Takao Mori
(Resources, Validation, Writing – original draft)
3
International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science
, Tsukuba, Japan
4
Graduate School of Pure and Applied Science, University of Tsukuba
, Tsukuba, Japan
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Sima Aminorroaya Yamini
Sima Aminorroaya Yamini
(Conceptualization, Formal analysis, Funding acquisition, Methodology, Writing – original draft)
5
School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney
, Sydney 2006, Australia
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a)Present address: Unconventional Computing Laboratory, University of the West of England, Bristol, United Kingdom. Author to whom correspondence should be addressed: [email protected]
Appl. Phys. Lett. 125, 203903 (2024)
Article history
Received:
August 28 2024
Accepted:
November 01 2024
Citation
Raphael Fortulan, Suwei Li, Michael John Reece, Illia Serhiienko, Takao Mori, Sima Aminorroaya Yamini; Enhanced thermoelectric performance of p-type BiSbTe through incorporation of magnetic CrSb. Appl. Phys. Lett. 11 November 2024; 125 (20): 203903. https://doi.org/10.1063/5.0235499
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