Home > Press > Extremely low thermal conductivity in 1D soft chain structure BiSeX (X = Br, I)
Schematic crystal structures and electronic localization functions (ELFs) of 2D, 1D, and soft 1D Bi2Se3, Sb2Se3 and BiSeI, respectively. Schematic diagrams and corresponding crystal structures of (a, d) 2D slabs in Bi2Se3, (b, e) 1D chain in Sb2Se3 and (c, f) 1D chain with migration of halogens in BiSeI. The crystal structures of Bi2Se3, Sb2Se3and BiSeI viewed along the c direction are given in (g-i), respectively. (j-l) The projected ELF along the chain. The isosurface level of ELF is 0.9. CREDIT ©Science China Press |
Abstract:
The low thermal transport properties are important for applications in thermoelectrics and thermal barrier coatings. Nowadays, the strategies to acquire low thermal conductivity in bulk materials include multi-scale defect (atomic, nano- and meso-scale), heavy molecular weight, complex crystal structure, larger unit cell and strong anharmonicity.
In a recent article in Science China Materials, Prof. Li-Dong Zhao from Beihang University and co-workers proposed a new strategy to search intrinsically low thermal conductivity in one-dimensional crystal structure. By using the first-principles calculations and experimental synthesis, they found a sort of material with extremely low thermal conductivity, namely BiSeX (X= Br, I) with one-dimensional chain structure. The mechanisms behind the low thermal conductivity were revealed from the aspect of crystal structure, by neutron powder-diffraction measurements and temperature tunable aberration-corrected scanning transmission electron microscopy (STEM).
To elucidate the origins of ultralow thermal conductivity, the authors make comparisons with several analogues that exhibit cubic- (3D), layer- (2D) and chain-like (1D) crystal structures and find that the thermal conductivity shows a decreasing trend from 3D, 2D to 1D (Fig. 1), which is due to the chemical bonding strength between the low-dimensional structure becoming progressively weaker and weaker.
"Based on these guidelines, we found that the chemical bonding along the chain further weakened with added halogen atom", said Prof. Zhao. Therefore, the chemical bondings of BiSeX along all three crystallographic directions are weaker than in other compounds (Fig. 2), showing a quasi-0D crystal structure.
Different from the ultrahigh thermal conductivity diamond (> 2000 W m-1 K-1) with strong covalent bond between carbon atoms, the phonon transport in bismuth selenohalides was significantly suppressed. As a result, they exhibit extremely low thermal conductivity. "The thermal conductivity of BiSeI at 573 K reaches ~0.27 W m-1 K-1, which is close to the theoretical minimum value", emphasized by Prof. Zhao.
These findings open up a prospect of achieving low thermal conductivity materials in one-dimensional chain-containing bulk structure with potential applications in the fields of thermal barrier coatings, thermoelectric materials, etc.
###
This work was published online in Science China Materials and highlighted by Science (Science, 368 (2020) 1325.) (Fig. 3).
This work was supported by the National Key Research and Development Program of China (2018YFA0702100, 2018YFB0703600), the National Natural Science Foundation of China (51772012, 51632005), the National Science Foundation for Distinguished Young Scholars (51925101), Shenzhen Peacock Plan team (KQTD2016022619565991), Beijing Natural Science Foundation (JQ18004), China Postdoctoral Science Foundation Grant (2019M650429) and 111 Project (B17002).
####
For more information, please click here
Contacts:
Li-Dong Zhao
Copyright © Science China Press
If you have a comment, please Contact us.Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.
Related Links |
Related News Press |
News and information
Simulating magnetization in a Heisenberg quantum spin chain April 5th, 2024
NRL charters Navy’s quantum inertial navigation path to reduce drift April 5th, 2024
Discovery points path to flash-like memory for storing qubits: Rice find could hasten development of nonvolatile quantum memory April 5th, 2024
Good as gold - improving infectious disease testing with gold nanoparticles April 5th, 2024
Thin films
Utilizing palladium for addressing contact issues of buried oxide thin film transistors April 5th, 2024
Understanding the mechanism of non-uniform formation of diamond film on tools: Paving the way to a dry process with less environmental impact March 24th, 2023
New study introduces the best graphite films: The work by Distinguished Professor Feng Ding at UNIST has been published in the October 2022 issue of Nature Nanotechnology November 4th, 2022
Govt.-Legislation/Regulation/Funding/Policy
NRL charters Navy’s quantum inertial navigation path to reduce drift April 5th, 2024
Discovery points path to flash-like memory for storing qubits: Rice find could hasten development of nonvolatile quantum memory April 5th, 2024
Chemical reactions can scramble quantum information as well as black holes April 5th, 2024
Possible Futures
Discovery points path to flash-like memory for storing qubits: Rice find could hasten development of nonvolatile quantum memory April 5th, 2024
With VECSELs towards the quantum internet Fraunhofer: IAF achieves record output power with VECSEL for quantum frequency converters April 5th, 2024
Discoveries
Chemical reactions can scramble quantum information as well as black holes April 5th, 2024
New micromaterial releases nanoparticles that selectively destroy cancer cells April 5th, 2024
Utilizing palladium for addressing contact issues of buried oxide thin film transistors April 5th, 2024
Announcements
NRL charters Navy’s quantum inertial navigation path to reduce drift April 5th, 2024
Discovery points path to flash-like memory for storing qubits: Rice find could hasten development of nonvolatile quantum memory April 5th, 2024
Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters
Simulating magnetization in a Heisenberg quantum spin chain April 5th, 2024
Discovery points path to flash-like memory for storing qubits: Rice find could hasten development of nonvolatile quantum memory April 5th, 2024
Tools
Ferroelectrically modulate the Fermi level of graphene oxide to enhance SERS response November 3rd, 2023
The USTC realizes In situ electron paramagnetic resonance spectroscopy using single nanodiamond sensors November 3rd, 2023
Battery Technology/Capacitors/Generators/Piezoelectrics/Thermoelectrics/Energy storage
What heat can tell us about battery chemistry: using the Peltier effect to study lithium-ion cells March 8th, 2024
A battery’s hopping ions remember where they’ve been: Seen in atomic detail, the seemingly smooth flow of ions through a battery’s electrolyte is surprisingly complicated February 16th, 2024
The latest news from around the world, FREE | ||
Premium Products | ||
Only the news you want to read!
Learn More |
||
Full-service, expert consulting
Learn More |
||