Approaching the minimum lattice thermal conductivity in TiCoSb half-Heusler alloys by intensified point-defect phonon scattering
Literature Information
Christophe Candolfi, Bertrand Lenoir
Half-Heusler (HH) alloys based on TiCoSb are becoming popular semiconducting materials for mid-temperature thermoelectric (TE) applications, due to their superior Seebeck coefficient, moderate electrical conductivity, and excellent mechanical properties. However, their practical applicability is mainly limited by their high lattice thermal conductivity. Here, we show how a multi-alloying approach that involves co-substitution of Zr and Hf on the Ti site and Bi on the Sb site can significantly lower the heat transport of the TiCo0.85Fe0.15Sb alloy due to enhanced mass and strain-field fluctuations in the lattice. The substantial rise in point-defect phonon scattering leads to a sharp reduction in the lattice thermal conductivity from 8 to 2 W m−1 K−1 at ∼300 K and from 5 to 1.74 W m−1 K−1 at ∼843 K in Ti0.5Zr0.2Hf0.3Co0.85Fe0.15Sb0.96Bi0.4. The achieved thermal conductivity is the lowest value reported so far among TiCoSb-based alloys. Importantly, the reduction in thermal conductivity outweighs the concomitant decrease in the power factor, ultimately leading to an improved thermoelectric figure of merit ZT. Our findings show that creating large point defects through heavy isovalent substitution is an effective approach to significantly reduce the phonon transport in HH alloys.
Recommended Journals
Related Literature
Self-assembled poly(2-ethyl-2-oxazoline) fibers in aqueous solutions
Pınar Tatar Güner, Annamária Mikó, Florian F. Schweinberger
DOI: 10.1039/C1PY00463H
Photo-cross-linked mPEG-poly(γ-cinnamyl-l-glutamate) micelles as stable drug carriers
Xiuli Hu, Zhigang Xie, Yubin Huang, Xiabin Jing
DOI: 10.1039/C2PY20049J
Cationic polyesters bearing pendent amino groups prepared by thiol–ene chemistry
Vincent Darcos, Sarah Antoniacomi, Cédric Paniagua, Jean Coudane
DOI: 10.1039/C1PY00414J
High molecular weight acrylonitrile–butadiene architectures via a combination of RAFT polymerization and orthogonal copper mediated azide–alkyne cycloaddition
Christoph J. Dürr, Sebastian G. J. Emmerling, Paul Lederhose, Andreas Kaiser, Sven Brandau, Michael Klimpel, Christopher Barner-Kowollik
DOI: 10.1039/C2PY00547F
Synthesis of poly(p-phenylene vinylene) materials via the precursor routes
Tanja Junkers, Joke Vandenbergh, Peter Adriaensens, Laurence Lutsen
DOI: 10.1039/C1PY00345C
Biodegradable, pH-sensitive P(CL-Pluronic-CL-co-MAA-MEG) hydrogel for 5-aminosalicylic acid delivery
Ke Wang, Qiang Fu, WeiFeng Li, Yang Gao, JiYe Zhang
DOI: 10.1039/C2PY20086D
Synthesis of terpene–poly(ethylene oxide)s by t-BuP4-promoted anionic ring-opening polymerization
Junpeng Zhao, Helmut Schlaad, Steffen Weidner, Markus Antonietti
DOI: 10.1039/C1PY00388G
You might also like
What industries use 4-(4-tert-Butylphenyl)-1H-pyrazol-3-amine (CAS: 1015845-73-4)?
4-(4-tert-Butylphenyl)-1H-pyrazol-3-amine finds applications in various industri...
What industries use H3TATAB (CAS: 63557-10-8)?
H3TATAB is used in the pharmaceutical industry for the synthesis of certain orga...
What are the main uses of 1-Ethyl-3-fluorobenzene (CAS: 696-39-9)?
1-Ethyl-3-fluorobenzene (CAS: 696-39-9) is primarily used as a precursor in the ...
What are the main uses of 1-(tert-Butoxycarbonyl)-4-(4-methoxyphenyl)pyrrolidine-3-carboxylic acid (CAS: 851484-94-1)?
1-(tert-Butoxycarbonyl)-4-(4-methoxyphenyl)pyrrolidine-3-carboxylic acid is prim...
What are the physical and chemical properties of 1-Cyclobutyl-4-piperidinone (CAS: 359880-05-0)?
1-Cyclobutyl-4-piperidinone (CAS: 359880-05-0) is a colorless or white crystalli...
What is Pyridine-2,6-dicarboxylic acid mono-tert-butyl ester (CAS: 575433-76-0)?
Pyridine-2,6-dicarboxylic acid mono-tert-butyl ester (CAS: 575433-76-0) is a che...
What is the market or research trend for 2,3-Difluorophenylalanine (CAS: 236754-62-4)?
The market for 2,3-Difluorophenylalanine (CAS: 236754-62-4) is growing with incr...
How is (2-Hydroxy-1-naphthyl)boronic acid (CAS: 898257-48-2) typically synthesized?
(2-Hydroxy-1-naphthyl)boronic acid can be synthesized through the reduction of 2...
What are the physical and chemical properties of tert-Butyl (5-bromo-6-methyl-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl)carbamate (CAS: 1315351-28-0)?
This compound is a crystalline solid with a molecular weight of approximately 52...
Are there alternatives to 5,7-Dihydroxy-4-oxo-2-(3,4,5-trihydroxyphenyl)-4H-chromen-3-yl beta-D-glucopyranoside (CAS: 19833-12-6) in synthesis?
While 5,7-Dihydroxy-4-oxo-2-(3,4,5-trihydroxyphenyl)-4H-chromen-3-yl beta-D-gluc...












![6-[2-(Trifluoromethoxy)phenyl]-2-pyridinecarboxylic acid structure 6-[2-(Trifluoromethoxy)phenyl]-2-pyridinecarboxylic acid structure](https://static.chemtradehub.com/structs/887/887983-48-4-f6ac.webp)
![Ethyl 2-[(3-bromo-4-pyridinyl)sulfanyl]-2-methylpropanoate structure Ethyl 2-[(3-bromo-4-pyridinyl)sulfanyl]-2-methylpropanoate structure](https://static.chemtradehub.com/structs/135/1352794-86-5-a8aa.webp)
![4-[2-(3,4-Dihydro-2H-chromen-6-yl)-1,3-oxazol-5-yl]-1-(3-{[(2,5-dioxo-1-pyrrolidinyl)oxy]carbonyl}benzyl)pyridinium bromide structure 4-[2-(3,4-Dihydro-2H-chromen-6-yl)-1,3-oxazol-5-yl]-1-(3-{[(2,5-dioxo-1-pyrrolidinyl)oxy]carbonyl}benzyl)pyridinium bromide structure](https://static.chemtradehub.com/structs/155/155863-03-9-8183.webp)
