Enhancing the thermoelectric performance of free solidified p-type Bi0.5Sb1.5Te3 alloy by manipulating its parent liquid state

Yu, Yuan; Zhu, Bin; Wu, Zhan; Huang, Zhongwen; Wang, Xiaoyu; Zu, Fang‐Qiu

doi:10.1016/j.intermet.2015.06.020

Cited by 22 publications

(9 citation statements)

References 46 publications

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“…However, the resistivity curves become smooth in the subsequent cooling processes, which suggests that the liquid state change is irreversible. The physical mechanism of this anomalous hump on the ρ-T curve was discussed in our previous work 15 , 16 , 25 . This abnormal phenomenon is well reproducible in several repeated experiments.…”

Section: Resultsmentioning

confidence: 80%

“…There has been a notable trend in engineering practices that the properties and solidified microstructures of many alloys are dependent on the thermal history of their parent liquids 15 – 18 . Both theoretical and experimental results suggest that the liquid structures and their properties might be discontinuously changed as a function of pressure or temperature 19 – 21 .…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the alteration of the solidification microstructures due to different thermal histories may be ascribed to their different liquid states. Hitherto, the temperature-induced liquid-liquid structural transition (TI-LLST) has been suggested to occur in some single- and multiple-component melts, such as Bi-Te 15 , 16 , Pb-Bi 22 , and Bi-Sb 23 by various reports. More significantly, changing the liquid states, based on the TI-LLST behaviour, has been confirmed to be effective in regulating the solidification processes and microstructures 15 – 17 , 22 , 23 .…”

Section: Introductionmentioning

confidence: 99%

“…Our previous studies demonstrated the feasibility of changing the liquid state to modify the solidification microstructures and TE properties of p-type Bi 2 Te 3 -based alloys 15 , 16 . This motivates us to further explore the effect of TI-LLST on their n-type counterparts.…”

Section: Introductionmentioning

confidence: 99%

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Dependence of Solidification for Bi2Te3−xSex Alloys on Their Liquid States

Cojocaru‐Mirédin

et al. 2017

Sci Rep

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The resistivity versus temperature (ρ-T) behaviours of liquid n-type Bi2Te3−xSex (x = 0.3, 0.45 and 0.6) alloys are explored up to 1050 °C. A clear hump is observed on all ρ-T curves of the three studied Bi2Te3−xSex melts during the heating process, which suggests that a temperature-induced liquid-liquid structural transition takes place in the melts. Based on this information, the solidification behaviours and microstructures of the alloys with different liquid states are investigated. The samples that experienced liquid structural transition show that the nucleation and growth undercooling degrees are conspicuously enlarged and the solidification time is shortened. As a result, the solidified lamellae are refined and homogenized, the prevalence of low-angle grain boundaries between these lamellae is increased, and the Vicker Hardness is enhanced. Atom probe tomography analyses prove that there is no segregation or nanoprecipitation within the grains, but the Te-rich eutectic structure and the evolution of composition near the Te-matrix phase boundary are investigated in a sample that experienced liquid structural transition. Our work implies that the solidification behaviours of Bi2Te3−xSex alloys are strongly related to their parent liquid states, providing an alternative approach to tailor the thermoelectric and mechanical properties even when only a simple solidification process is performed.

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Section: Resultsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dependence of Solidification for Bi2Te3−xSex Alloys on Their Liquid States

Cojocaru‐Mirédin

et al. 2017

Sci Rep

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“…The composite of (Bi 2 Te 3 ) 0.25 −(Sb 2 Te 3 ) 0.75 exhibits the lowest σ, ranging from 10.5 × 10 3 to 22.9 × 10 3 S m −1 in the whole temperature range. By striking contrast, a single-phase p-type Bi 0.5 Sb 1.5 Te 3 9,30,37,38 with the same nominal composition as the composite with x = 0.25 has a much higher value of σ (∼100 × 10 3 S m −1 ), which demonstrates the strong influence of PNJs on σ.…”

Section: Methodsmentioning

confidence: 94%

Thermoelectric Performance of Sb₂Te₃-Based Alloys is Improved by Introducing PN Junctions

Wang

Xiang³

et al. 2018

ACS Appl. Mater. Interfaces

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Interface engineering has been demonstrated to be an effective strategy for enhancing the thermoelectric (TE) performance of materials. However, a very typical interface in semiconductors, that is, the PN junction (PNJ), is scarcely adopted by the thermoelectrical community because of the coexistence of holes and electrons. Interestingly, our explorative results provide a definitively positive case that appropriate PNJs are able to enhance the TE performance of p-type SbTe-based alloys. Specifically, owing to the formation of the charge-depletion layer and built-in electric field, the carrier concentration and transport can be optimized and thus the power factor is improved and the electronic thermal conductivity is decreased. Meanwhile, PNJs provide scattering centers for phonons, leading to a reduced lattice thermal conductivity. Consequently, the p-type (BiTe)-(SbTe) composites comprising PNJs achieve a ∼131% improvement of the ZT value compared with the pure SbTe. The increased ZT demonstrates the feasibility of improving the TE properties by introducing PNJs, which will open a new and effective avenue for designing TE alloys with high performance.

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Thermoelectric Silver‐Based Chalcogenides

et al. 2022

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Heat is abundantly available from various sources including solar irradiation, geothermal energy, industrial processes, automobile exhausts, and from the human body and other living beings. However, these heat sources are often overlooked despite their abundance, and their potential applications remain underdeveloped. In recent years, important progress has been made in the development of high-performance thermoelectric materials, which have been extensively studied at medium and high temperatures, but less so at near room temperature. Silver-based chalcogenides have gained much attention as near room temperature thermoelectric materials, and they are anticipated to catalyze tremendous growth in energy harvesting for advancing internet of things appliances, self-powered wearable medical systems, and self-powered wearable intelligent devices. This review encompasses the recent advancements of thermoelectric silver-based chalcogenides including binary and multinary compounds, as well as their hybrids and composites. Emphasis is placed on strategic approaches which improve the value of the figure of merit for better thermoelectric performance at near room temperature via engineering material size, shape, composition, bandgap, etc. This review also describes the potential of thermoelectric materials for applications including self-powering wearable devices created by different approaches. Lastly, the underlying challenges and perspectives on the future development of thermoelectric materials are discussed.

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Enhancing the thermoelectric performance of free solidified p-type Bi0.5Sb1.5Te3 alloy by manipulating its parent liquid state

Cited by 22 publications

References 46 publications

Dependence of Solidification for Bi2Te3−xSex Alloys on Their Liquid States

Dependence of Solidification for Bi2Te3−xSex Alloys on Their Liquid States

Thermoelectric Performance of Sb₂Te₃-Based Alloys is Improved by Introducing PN Junctions

Thermoelectric Silver‐Based Chalcogenides

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Enhancing the thermoelectric performance of free solidified p-type Bi0.5Sb1.5Te3 alloy by manipulating its parent liquid state

Cited by 22 publications

References 46 publications

Dependence of Solidification for Bi2Te3−xSex Alloys on Their Liquid States

Dependence of Solidification for Bi2Te3−xSex Alloys on Their Liquid States

Thermoelectric Performance of Sb2Te3-Based Alloys is Improved by Introducing PN Junctions

Thermoelectric Silver‐Based Chalcogenides

Contact Info

Product

Resources

About

Thermoelectric Performance of Sb₂Te₃-Based Alloys is Improved by Introducing PN Junctions