Skutterudites: Progress and Challenges

Rogl, Gerda; Rogl, P.

doi:10.1007/978-3-030-12057-3_9

Cited by 10 publications

(5 citation statements)

References 144 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…PbTe alloys have the additional issue of Pb toxicity but have been widely deployed in the space sector (Lalonde et al, 2011) due to a remarkably high zT that can reach 2.5 (Tan et al, 2016). The sulphides have not offered quite the same maximum performance as the other chalcogenides, but elemental abundance is an advantage in materials such as Cu 2 S which show zT ∼ 1 (Ge et al, 2018;Mikuła et al, 2020) Half-Heuslers (Joshi et al, 2014;Zhou et al, 2018), clathrates (Deng et al, 2010), and skutterudites (Rogl et al, 2015;Rogl and Rogl, 2019) have all shown zT ≥ 1, whilst oxides and SiGe offer good performance at high temperature (Nozariasbmarz et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Celebrating 1 year of Frontiers in Electronic Materials

2024

Frontiers Research Topics

View full text Add to dashboard Cite

Frontiers is more than just an open access publisher of scholarly articles: it is a pioneering approach to the world of academia, radically improving the way scholarly research is managed. The grand vision of Frontiers is a world where all people have an equal opportunity to seek, share and generate knowledge. Frontiers provides immediate and permanent online open access to all its publications, but this alone is not enough to realize our grand goals. Frontiers journal seriesThe Frontiers journal series is a multi-tier and interdisciplinary set of openaccess, online journals, promising a paradigm shift from the current review, selection and dissemination processes in academic publishing. All Frontiers journals are driven by researchers for researchers; therefore, they constitute a service to the scholarly community. At the same time, the Frontiers journal series operates on a revolutionary invention, the tiered publishing system, initially addressing specific communities of scholars, and gradually climbing up to broader public understanding, thus serving the interests of the lay society, too. Dedication to qualityEach Frontiers article is a landmark of the highest quality, thanks to genuinely collaborative interactions between authors and review editors, who include some of the world's best academicians. Research must be certified by peers before entering a stream of knowledge that may eventually reach the public -and shape society; therefore, Frontiers only applies the most rigorous and unbiased reviews. Frontiers revolutionizes research publishing by freely delivering the most outstanding research, evaluated with no bias from both the academic and social point of view. By applying the most advanced information technologies, Frontiers is catapulting scholarly publishing into a new generation. What are Frontiers Research Topics?Frontiers Research Topics are very popular trademarks of the Frontiers journals series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area.

show abstract

Section: Introductionmentioning

confidence: 99%

Celebrating 1 year of Frontiers in Electronic Materials

2024

Frontiers Research Topics

View full text Add to dashboard Cite

show abstract

“…Superior TE materials are governed by a dimensionless parameter, the figure of merit ( zT ), which is a function of the material’s Seebeck coefficient (α), electrical resistivity (ρ), and thermal conductivity ( k ). Many material systems with excellent TE properties were reported in the recent past, such as chalcogenides, − silicides, , antimonides, , etc. Even though TE materials with zT > 2 have been realized in laboratories, commercial TEGs claim η < 10% due to the engineering challenges such as electrical and thermal losses at the various contacts, the mechanical, thermal, and chemical stability of TE materials at elevated temperature, oxidation issues, etc.…”

Section: Introductionmentioning

confidence: 99%

A Constant Properties Model for the Performance Estimation in Segmented Thermoelectric Generator Elements and Its Experimental Validation Using an n-Type Mg₂Si_0.3Sn_0.7–Bi₂Te_2.7Se_0.3 Segmented Leg

Jayachandran

Dasgupta

Singh

2023

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Segmenting multiple compatible thermoelectric (TE) materials can improve the conversion efficiency in thermoelectric generators (TEGs) compared to single-material TEGs. A model to accurately estimate the performance in segmented TEGs is essential for optimizing the geometric parameters. Constant properties models (CPMs) help in the quick estimation of the performance of TEGs working under large temperature differences using averaged material properties. This work discusses a CPM to predict the performance of single and segmented TEG elements using a combination of temperature-averaged and spatially-averaged TE properties. Spatial averaging requires the knowledge of the temperature profile across the TEG element length, which was obtained by solving the heat balance equation with a numerical integration approach as suggested by Ponnusamy et al. In this work, we develop the CPM for the segmented TEG elements (CPMS). The model predictions were validated experimentally from the performance evaluation of single Mg 2 (Si 0.3 Sn 0.7 ) 0.98 Bi 0.02 and segmented Mg 2 (Si 0.3 Sn 0.7 ) 0.98 Bi 0.02 − Bi 2 (Te 2.7 Se 0.3 ) 0.98 (CuI) 0.02 TEG elements. Single and segmented TEG elements with Cu contacts were prepared by a hot-pressing technique. Both Mg 2 (Si 0.3 Sn 0.7 ) 0.98 Bi 0.02 and Bi 2 (Te 2.7 Se 0.3 ) 0.98 (CuI) 0.02 TE materials show peak zT > 1 in their measurement range. The experimental results show a maximum efficiency (η max ) of ∼8.25% with 18% improvement for the segmented structure at ΔT ≈ 302 K. The improvement mainly originated from lower heat input (Q in ) even though the maximum power output (P max ) became lower by ∼30%. The performance prediction using the CPM matches well with <10% error for P max and η max for the single TEG element, and using the CPMS, the predictions were <10% error for P max and <25% error for η max for the segmented TEG element experimental results. This work demonstrates how CPMS can be used to predict device performance characteristics in segmented TEGs.

show abstract

“…The desire for crystalline-like electron transport and amorphous (glass)-like heat transport is encapsulated by the 'phonon glass electron crystal' (PGEC) concept originally put forward by Slack [4]. Among the most widely-studied PGEC materials are the skutterudites and inorganic clathrates [5][6][7][8][9], which are 'cage' compounds with large intrinsic cavities that can incorporate loosely-bound guest ions to act as phononscattering centres while electronic transport occurs through the crystalline host framework.…”

Section: Introductionmentioning

confidence: 99%

Impact of noble-gas filler atoms on the lattice thermal conductivity of CoSb₃ skutterudites: first-principles modelling

Tang

Skelton

2021

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

We present a systematic first-principles modelling study of the structural dynamics and thermal transport in the CoSb3 skutterudites with a series of noble-gas filler atoms. A range of analysis techniques are proposed to estimate the filler rattling frequencies, to quantify the separate impacts of filling on the phonon group velocities and lifetimes, and to show how changes to the phonon spectra and interaction strengths lead to suppressed lifetimes. The fillers are found to reduce the thermal conductivity of the CoSb3 framework by up to 15 % primarily by suppressing the group velocities of low-lying optic modes. Calculations show that the filler rattling frequencies are determined by a detailed balance of increasing atomic mass and stronger interactions with the framework, and are a good predictor of their impact on the heat transport. Lowering the rattling frequency below ~1.5 THz by selecting heavy fillers that interact weakly with the framework is predicted to produce a much larger suppression of the thermal transport, by inducing avoided crossings in the acoustic-mode dispersion and facilitating resonant scattering with a consequent large reduction in the lifetimes. Approximate rattling frequencies determined from the harmonic force constants may therefore provide a useful metric for selecting filler atoms to optimise the thermal transport in skutterudites and other cage compounds such as clathrates.

show abstract

Skutterudites: Progress and Challenges

Cited by 10 publications

References 144 publications

Celebrating 1 year of Frontiers in Electronic Materials

Celebrating 1 year of Frontiers in Electronic Materials

A Constant Properties Model for the Performance Estimation in Segmented Thermoelectric Generator Elements and Its Experimental Validation Using an n-Type Mg₂Si_0.3Sn_0.7–Bi₂Te_2.7Se_0.3 Segmented Leg

Impact of noble-gas filler atoms on the lattice thermal conductivity of CoSb₃ skutterudites: first-principles modelling

Contact Info

Product

Resources

About

Skutterudites: Progress and Challenges

Cited by 10 publications

References 144 publications

Celebrating 1 year of Frontiers in Electronic Materials

Celebrating 1 year of Frontiers in Electronic Materials

A Constant Properties Model for the Performance Estimation in Segmented Thermoelectric Generator Elements and Its Experimental Validation Using an n-Type Mg2Si0.3Sn0.7–Bi2Te2.7Se0.3 Segmented Leg

Impact of noble-gas filler atoms on the lattice thermal conductivity of CoSb3 skutterudites: first-principles modelling

Contact Info

Product

Resources

About

A Constant Properties Model for the Performance Estimation in Segmented Thermoelectric Generator Elements and Its Experimental Validation Using an n-Type Mg₂Si_0.3Sn_0.7–Bi₂Te_2.7Se_0.3 Segmented Leg

Impact of noble-gas filler atoms on the lattice thermal conductivity of CoSb₃ skutterudites: first-principles modelling