| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Electronegative S/Se co-filled and Fe-substituted p-type skutterudites prepared by high-temperature and high-pressure technique |
| Xiaoxu Kang(康晓旭)1, Hongan Ma(马红安)2, Xin Fan(范鑫)1, Mingye Sun(孙明烨)1,†, Guihong Zuo(左桂鸿)1,‡, and Youjin Zheng(郑友进)1 |
1 School of Physics and Electronic Engineering, Mudanjiang Normal University, Mudanjiang 157011, China;
2 State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China |
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Abstract Although n-type skutterudites modified by electropositive fillers have been extensively studied, research on p-type skutterudites filled with electronegative elements remains scarce. In this work, a series of sulfur/selenium (S/Se) co-filled and iron (Fe)-doped p-type skutterudite samples with a nominal composition of S$_{0.1-x}$Se$_{x}$Fe$_{0.2}$Co$_{3.8}$Sb$_{12}$ ($x= 0.025$, 0.05, 0.075, 0.1) were rapidly synthesized via the high-temperature and high-pressure (HPHT) technique. Phase analysis indicates that the as-prepared samples possess a pure skutterudite structure without obvious impurity phases. Microstructural observations demonstrate that S/Se co-filling can effectively regulate the grain morphology and the evolution of grain size. Electrical transport measurements reveal that Fe substitution successfully induces p-type conductivity and optimizes the carrier transport behavior. Meanwhile, S/Se co-filling introduces strong phonon scattering, which significantly reduces the lattice thermal conductivity. For the optimal S$_{0.075}$Se$_{0.025}$Fe$_{0.2}$Co$_{3.8}$Sb$_{12}$, fitting based on the Debye-Callaway model confirms that the resonant frequencies of S and Se are 43.96 cm$^{-1}$ and 35 cm$^{-1}$, respectively. Finally, the S$_{0.075}$Se$_{0.025}$Fe$_{0.2}$Co$_{3.8}$Sb$_{12}$ sample achieves a maximum $zT$ value of approximately 0.22 at 673.15 K. This study provides a feasible strategy for constructing electronegative element co-filled p-type skutterudites and deepens the understanding of multiscale phonon scattering mechanisms in thermoelectric materials.
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Received: 24 April 2026
Revised: 30 May 2026
Accepted manuscript online: 04 June 2026
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PACS:
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72.15.Jf
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(Thermoelectric and thermomagnetic effects)
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72.20.Pa
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(Thermoelectric and thermomagnetic effects)
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72.20.-i
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(Conductivity phenomena in semiconductors and insulators)
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07.35.+k
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(High-pressure apparatus; shock tubes; diamond anvil cells)
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| Fund: Project supported by the Natural Science Priority Foundation of Heilongjiang Province (Grant No. ZL2024E014), the Heilongjiang Provincial Department of Education Project (Grant No. 1455MNUZX001), and the Key R&D Program Project of Mudanjiang City (Grant No. XDHD25AR013). |
Corresponding Authors:
Mingye Sun, Guihong Zuo
E-mail: sunmingye203@126.com;zuoguihongmsy@163.com
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Cite this article:
Xiaoxu Kang(康晓旭), Hongan Ma(马红安), Xin Fan(范鑫), Mingye Sun(孙明烨), Guihong Zuo(左桂鸿), and Youjin Zheng(郑友进) Electronegative S/Se co-filled and Fe-substituted p-type skutterudites prepared by high-temperature and high-pressure technique 2026 Chin. Phys. B 35 087201
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