Thermoelectric properties of Fe and Al double substituted MnSi (γ~1.73)

Thermoelectric materials offer an alternative opportunity to tackle the energy crisis and environmental problems by enabling the direct solid-state energy conversion. As a promising candidate with full potentials for the next generation thermoelectrics, tin selenide (SnSe) and its associated thermoelectric materials have been attracted extensive attentions due to their ultralow thermal conductivity and high electrical transport performance (power factor). To provide a thorough overview of recent advances in SnSe-based thermoelectric materials that have been revealed as promising thermoelectric materials since 2014, here, we first focus on the inherent relationship between the structural characteristics and the supreme thermoelectric performance of SnSe, including the thermodynamics, crystal structures, and electronic structures. The effects of phonon scattering, pressure or strain, and oxidation behavior on the thermoelectric performance of SnSe are discussed in detail. Besides, we summarize the current theoretical calculations to predict and understand the thermoelectric performance of SnSe, and provide a comprehensive summary on the current synthesis, characterization, and thermoelectric performance of both SnSe crystals and polycrystals, and their associated materials. In the end, we point out the controversies, challenges and strategies toward future enhancements of the SnSe thermoelectric materials.

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“…However, S max may decrease to some extent. More frequently used relationship between S and n can be described as [191][192][193]:…”

Section: Carrier Concentration Tuningmentioning

confidence: 99%

High-performance SnSe thermoelectric materials: Progress and future challenge

Chen

Zhao

Zou

2018

Progress in Materials Science

441

410

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“…High-purity polycrystaline HMS can be synthesized by various high temperature or high energy methods, such as arc melting, [97] induction melting, [124] solid state reaction, [100,112,118] melt quenching, [113,125] thermal explosion, [28] Na-Si melting [126] and one-step SPS method. [99] Few impurities, such as MnSi [64,98,113,124,127,128] and Si, [98,99,[128][129][130][131] can be observed in the as-synthesized products. By increasing the Si/Mn ratio to 1.80, Luo et al [98] have removed these impurites.…”

Section: Syntheses Of Polycrystaline Hmsmentioning

confidence: 99%

Eco‐Friendly Higher Manganese Silicide Thermoelectric Materials: Progress and Future Challenges

Liu

Chen

Zou

2018

Advanced Energy Materials

118

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As a promising thermoelectric material, higher manganese silicides are composed of earth-abundant and eco-friendly elements, and have attracted extensive attention for future commercialization. In this review, the authors firstly summarise the crystal structure, band structure, synthesis method and pristine thermoelectric performance of different higher manganese silicides. After that, the strategies for enhancing electrical performance and reducing lattice thermal conductivity of higher manganese silicides as well as their synergistion are highlighted. The application potentials including the chemical and mechanical stability of higher manganese silicides and their energy conversion efficiency of the assembled thermoelectric modules are also summarised. By analysising the current advances in higher manganese silicides, this review proposes that potential methods of further enhancing zT of higher manganese silicide lie in enhancing electrical performance with simultaneously reducing lattice thermal conductivity via effectively reducing effective mass, optimizing carrier concentration, and nanostrcutre engineering.

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“…5. 46 In addition, the maximum PF of the QH sample occurs at a higher temperature than those of SSR and MA samples, likely because of suppression of the bipolar effect as a result of an increased majority carrier concentration. The room-temperature value for the QH sample is 648 S cm À1 , which is about 35% higher than that of the SSR sample (482 S cm À1 ).…”

Section: View Article Onlinementioning

confidence: 99%

“…This PF is comparable to the high values achieved in the Cr-doped HMS (B2 Â 10 À3 W m À1 K À2 at 800 K) 26 and (Al,Fe) co-doped HMS (1.95 Â 10 À3 W m À1 K À2 at 800 K). 46 In addition, the maximum PF of the QH sample occurs at a higher temperature than those of SSR and MA samples, likely because of suppression of the bipolar effect as a result of an increased majority carrier concentration. 47…”

Section: Electrical Transport Propertiesmentioning

confidence: 99%

Enhanced thermoelectric power factor of Re-substituted higher manganese silicides with small islands of MnSi secondary phase

et al. 2015

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Higher manganese silicides (HMS) are promising thermoelectric materials owing to the abundance of the constituent elements in the earth crust, environmental friendliness and good chemical stability at high temperatures. However, the metallic MnSi layers with a lateral size as large as B50 mm are formed in the melt-grown HMS samples. These large MnSi layers are characterized with relatively high electrical and thermal conductivities and low Seebeck coefficient, which can degrade the thermoelectric performance of the melt-grown samples. Here, we report the synthesis and thermoelectric properties of Re-substituted HMS with relatively small-size MnSi platelets via melt-quenching, followed by ball-milling, and consolidated by spark plasma sintering. As compared to the samples prepared by either solid-state reaction or mechanical alloying, the reduced lateral size of MnSi in the quenched sample leads to an increased carrier concentration without a reduction in the carrier mobility according to our electrical transport measurements. As a result, the thermoelectric power factor is increased to 1.9 AE 0.2 Â 10 À3 W m À1 K À2 at 860 K, which is about 20% higher than that of the sample prepared by solid-state reaction. In addition, the lattice thermal conductivity of the quenched sample remains nearly the same as the samples prepared by two other synthesis methods. Therefore, a figure-of-merit ZT of 0.64 AE 0.08 at 823 K is obtained for the quenched sample, compared to 0.57 AE 0.07 and 0.26 AE 0.03 obtained from the two other samples prepared by different methods.

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Thermoelectric properties of Fe and Al double substituted MnSi (γ~1.73)

Cited by 29 publications

References 34 publications

High-performance SnSe thermoelectric materials: Progress and future challenge

High-performance SnSe thermoelectric materials: Progress and future challenge

Eco‐Friendly Higher Manganese Silicide Thermoelectric Materials: Progress and Future Challenges

Enhanced thermoelectric power factor of Re-substituted higher manganese silicides with small islands of MnSi secondary phase

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