Effect of Mg deficiency on the thermoelectric properties of Mg2(Si, Sn) solid solutions

Byeon, Seokyeong; Wiendlocha, Bartłomiej; Boor, Johannes de; Nielsch, Kornelius; Jin, Hyungyu

doi:10.1016/j.jallcom.2023.170157

Cited by 3 publications

(3 citation statements)

References 57 publications

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“…The flaws limiting strength include volume type (e.g., pores/cavities, agglomerates, porous regions, inclusions, and large grains), surface type (e.g., handling damage, machining damage, pitting, oxidation, and chemical product), and edge type (e.g., edge chipping) . As shown in Figure b, the Mg-deficient compound Mg 1.9 (SiSn) sintered at 973 K for 4 h in a vacuum after mechanical alloying had different defects like elemental agglomeration (Si), pores, etc . These defects lead to unpredictable changes or degradation in TE performance.…”

Section: Challenges and Major Issues Of The Magnesium-based Te Materi...mentioning

confidence: 99%

“… 69 As shown in Figure 3 b, the Mg-deficient compound Mg 1.9 (SiSn) sintered at 973 K for 4 h in a vacuum after mechanical alloying had different defects like elemental agglomeration (Si), pores, etc. 70 These defects lead to unpredictable changes or degradation in TE performance. Meanwhile, suitable mechanical strength and hardness are crucial to prevent surface damage during handling, and leg production such as the cutting and packing process.…”

Section: Challenges and Major Issues Of The Magnesium-based Te Materi...mentioning

confidence: 99%

“… (a) Some of the broken Mg 2 Si 0.4 Sn 0.6 pellets after sintering in our trial test, (b) EDS mapping on sintered magnesium deficient Mg 1.9 (Si,Sn) alloy. 70 Reproduced with permission from ref ( 70 ), Copyright [2023] [Elsevier]. …”

Section: Challenges and Major Issues Of The Magnesium-based Te Materi...mentioning

confidence: 99%

See 2 more Smart Citations

Low-Cost Magnesium-Based Thermoelectric Materials: Progress, Challenges, and Enhancements

Zhang,

Gurtaran,

Dong

2024

ACS Appl. Energy Mater.

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Magnesium-based thermoelectric (TE) materials have attracted considerable interest due to their high ZT values, coupled with their low cost, widespread availability, nontoxicity, and low density. In this review, we provide a succinct overview of the advances and strategies pertaining to the development of Mg-based materials aimed at enhancing their performance. Following this, we delve into the major challenges posed by the severe working conditions, such as high temperature and thermal cycling, which adversely impact the behavior and long-term stability of the TE modules. Challenges include issues like the lack of mechanical strength, chemical instability, and unreliable contact. Subsequently, we focus on the key methodologies aimed at addressing these challenges to facilitate the broader application of the TE modules. These include boosting the mechanical strength, especially the toughness, through grain refining and additions of second phases. Furthermore, strategies targeted at enhancing the chemical stability through coatings and modifying the microstructure, as well as improving the contact design and materials, are discussed. In the end, we highlight the perspectives for boosting the practical applications of Mg-based TE materials in the future.

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Section: Challenges and Major Issues Of The Magnesium-based Te Materi...mentioning

confidence: 99%

Section: Challenges and Major Issues Of The Magnesium-based Te Materi...mentioning

confidence: 99%

See 1 more Smart Citation

Low-Cost Magnesium-Based Thermoelectric Materials: Progress, Challenges, and Enhancements

Zhang,

Gurtaran,

Dong

2024

ACS Appl. Energy Mater.

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Simple Synthesis and Thermoelectric Properties of Mg2 + xSi0.5Sn0.5Sb0.075 Materials with Heterogeneous Microstructure

Jang,

Min,

Kim

et al. 2024

Korean J. Chem. Eng.

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Thermoelectric properties of sintered Ba2AgSi3 crystals and search for impurities to control conductivity type by first-principles calculation

Kajihara,

Koda,

Ishiyama

et al. 2024

Journal of Applied Physics

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In this study, the basic properties of Ba2AgSi3 were investigated in detail from both experimental and computational viewpoints. Polycrystalline Ba2AgSi3 formed by an arc-melting apparatus under an argon atmosphere was ground into powders, and then powder samples were sintered using the spark plasma sintering method. Both n-type and p-type samples were obtained. This may be due to a slight deviation from the stoichiometric composition. The energy bandgap of Ba2AgSi3 was measured to be around 0.17 eV from the temperature dependence of electrical conductivity and was in agreement with that by first-principles calculations. Sintered samples exhibited a high Seebeck coefficient of −273 μV K−1 and a high power factor of 0.38 mW m−1 K−2 at 307 K for n-type samples. They were 217 μV K−1 and 0.23 mW m−1 K−2, respectively, at 320 K for p-type samples. The electronic structures of impurity-doped Ba2AgSi3 were also discussed using first-principles calculations to investigate the insertion site of impurity atoms. The calculations suggest that the substitution of B (P) at any Si site shifts the Fermi level and transforms it into p-type (n-type) semiconductors. On the other hand, substitution of Ba or Ag sites with B or P is unlikely to occur in terms of formation energy.

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Effect of Mg deficiency on the thermoelectric properties of Mg2(Si, Sn) solid solutions

Cited by 3 publications

References 57 publications

Low-Cost Magnesium-Based Thermoelectric Materials: Progress, Challenges, and Enhancements

Low-Cost Magnesium-Based Thermoelectric Materials: Progress, Challenges, and Enhancements

Simple Synthesis and Thermoelectric Properties of Mg2 + xSi0.5Sn0.5Sb0.075 Materials with Heterogeneous Microstructure

Thermoelectric properties of sintered Ba2AgSi3 crystals and search for impurities to control conductivity type by first-principles calculation

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