ChemInform Abstract: Probing the Lower Limit of Lattice Thermal Conductivity in an Ordered Extended Solid: Gd117Co56Sn112, a Phonon Glass-Electron Crystal System.

ChemInform ◽  
2012 ◽  
Vol 43 (32) ◽  
pp. no-no
Author(s):  
Devin C. Schmitt ◽  
Neel Haldolaarachchige ◽  
Yimin Xiong ◽  
David P. Young ◽  
Rongying Jin ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Lower Limit ◽  
Lattice Thermal Conductivity ◽  
Crystal System ◽  
Electron Crystal

Probing the Lower Limit of Lattice Thermal Conductivity in an Ordered Extended Solid: Gd117Co56Sn112, a Phonon Glass–Electron Crystal System

2012 ◽  
Vol 134 (13) ◽  
pp. 5965-5973 ◽  
Author(s):  
Devin C. Schmitt ◽  
Neel Haldolaarachchige ◽  
Yimin Xiong ◽  
David P. Young ◽  
Rongying Jin ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Lower Limit ◽  
Lattice Thermal Conductivity ◽  
Crystal System ◽  
Electron Crystal

scholarly journals Zintl-phase Eu2ZnSb2: A promising thermoelectric material with ultralow thermal conductivity

2019 ◽  
Vol 116 (8) ◽  
pp. 2831-2836 ◽  
Author(s):  
Chen Chen ◽  
Wenhua Xue ◽  
Shan Li ◽  
Zongwei Zhang ◽  
Xiaofang Li ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermoelectric Material ◽  
Thermoelectric Materials ◽  
Lattice Thermal Conductivity ◽  
Domain Boundary ◽  
Zn Deficiency ◽  
Zintl Phase ◽  
Medium Temperature ◽  
Inversion Domain ◽  
Electron Crystal

Zintl compounds are considered to be potential thermoelectric materials due to their “phonon glass electron crystal” (PGEC) structure. A promising Zintl-phase thermoelectric material, 2-1-2–type Eu2ZnSb2 (P63/mmc), was prepared and investigated. The extremely low lattice thermal conductivity is attributed to the external Eu atomic layers inserted in the [Zn2Sb2]2- network in the structure of 1-2-2–type EuZn2Sb2(P3¯m1), as well as the abundant inversion domain boundary. By regulating the Zn deficiency, the electrical properties are significantly enhanced, and the maximum ZT value reaches ∼1.0 at 823 K for Eu2Zn0.98Sb2. Our discovery provides a class of Zintl thermoelectric materials applicable in the medium-temperature range.

Anharmonic phonon frequency and ultralow lattice thermal conductivity in β-Cu2Se liquid-like thermoelectrics

2020 ◽  
Vol 22 (48) ◽  
pp. 28086-28092
Author(s):  
Wenjie Zhang ◽  
Chong Zheng ◽  
Yanbing Dong ◽  
Jia-Yue Yang ◽  
Linhua Liu
Keyword(s):  
Thermal Conductivity ◽  
Thermoelectric Material ◽  
Lattice Thermal Conductivity ◽  
Phonon Frequency ◽  
Electron Crystal

The prototype phonon-liquid electron-crystal β-Cu2Se has been ranked among the best thermoelectric material with its ultralow lattice thermal conductivity (κL).

Demonstration of a phonon-glass electron-crystal strategy in (Hf,Zr)NiSn half-Heusler thermoelectric materials by alloying

2015 ◽  
Vol 3 (45) ◽  
pp. 22716-22722 ◽  
Author(s):  
Yintu Liu ◽  
Hanhui Xie ◽  
Chenguang Fu ◽  
G. Jeffrey Snyder ◽  
Xinbing Zhao ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electron Transport ◽  
Thermoelectric Materials ◽  
Lattice Thermal Conductivity ◽  
Negligible Effect ◽  
Atomic Disorder ◽  
Electron Crystal

The atomic disorder of Zr/Hf sites in (Hf,Zr)NiSn alloys effectively reduces lattice thermal conductivity and has a negligible effect on electron transport, demonstrating an effective phonon-glass electron-crystal strategy.

Lower limit to the lattice thermal conductivity of nanostructured Bi2Te3-based materials

2009 ◽  
Vol 106 (7) ◽  
pp. 073503 ◽  
Author(s):  
Catalin Chiritescu ◽  
Clay Mortensen ◽  
David G. Cahill ◽  
David Johnson ◽  
Paul Zschack
Keyword(s):  
Thermal Conductivity ◽  
Lower Limit ◽  
Lattice Thermal Conductivity

Lattice Thermal Conductivity Modelling of a Diatomic Nanoscale Material

2020 ◽  
Vol 10 (5) ◽  
pp. 602-609
Author(s):  
Adil H. Awad
Keyword(s):  
Thermal Conductivity ◽  
Lattice Thermal Conductivity ◽  
Phonon Scattering ◽  
Correction Term ◽  
Nanoscale Material ◽  
New Approach ◽  
Two Samples ◽  
Conductivity Modelling ◽  
Callaway Model

Introduction: A new approach for expressing the lattice thermal conductivity of diatomic nanoscale materials is developed. Methods: The lattice thermal conductivity of two samples of GaAs nanobeam at 4-100K is calculated on the basis of monatomic dispersion relation. Phonons are scattered by nanobeam boundaries, point defects and other phonons via normal and Umklapp processes. Methods: A comparative study of the results of the present analysis and those obtained using Callaway formula is performed. We clearly demonstrate the importance of the utilised scattering mechanisms in lattice thermal conductivity by addressing the separate role of the phonon scattering relaxation rate. The formulas derived from the correction term are also presented, and their difference from Callaway model is evident. Furthermore their percentage contribution is sufficiently small to be neglected in calculating lattice thermal conductivity. Conclusion: Our model is successfully used to correlate the predicted lattice thermal conductivity with that of the experimental observation.

scholarly journals Local ferroelectric polarization switching driven by nanoscale distortions in thermoelectric $${\text {Sn}}_{0.7}{\text {Ge}}_{0.3}{\text {Te}}$$

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Aastha Vasdev ◽  
Moinak Dutta ◽  
Shivam Mishra ◽  
Veerpal Kaur ◽  
Harleen Kaur ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Figure Of Merit ◽  
Room Temperature ◽  
Lattice Thermal Conductivity ◽  
Direct Evidence ◽  
Temperature Dependent ◽  
Force Microscopy ◽  
Ferroelectric Domains ◽  
Pdf Analysis ◽  
Ferroelectric Transition Temperature

AbstractA remarkable decrease in the lattice thermal conductivity and enhancement of thermoelectric figure of merit were recently observed in rock-salt cubic SnTe, when doped with germanium (Ge). Primarily, based on theoretical analysis, the decrease in lattice thermal conductivity was attributed to local ferroelectric fluctuations induced softening of the optical phonons which may strongly scatter the heat carrying acoustic phonons. Although the previous structural analysis indicated that the local ferroelectric transition temperature would be near room temperature in $${\text {Sn}}_{0.7}{\text {Ge}}_{0.3}{\text {Te}}$$ Sn 0.7 Ge 0.3 Te , a direct evidence of local ferroelectricity remained elusive. Here we report a direct evidence of local nanoscale ferroelectric domains and their switching in $${\text {Sn}}_{0.7}{\text {Ge}}_{0.3}{\text {Te}}$$ Sn 0.7 Ge 0.3 Te using piezoeresponse force microscopy(PFM) and switching spectroscopy over a range of temperatures near the room temperature. From temperature dependent (250–300 K) synchrotron X-ray pair distribution function (PDF) analysis, we show the presence of local off-centering distortion of Ge along the rhombohedral direction in global cubic $${\text {Sn}}_{0.7}{\text {Ge}}_{0.3}{\text {Te}}$$ Sn 0.7 Ge 0.3 Te . The length scale of the $${\text {Ge}}^{2+}$$ Ge 2 + off-centering is 0.25–0.10 Å near the room temperatures (250–300 K). This local emphatic behaviour of cation is the cause for the observed local ferroelectric instability, thereby low lattice thermal conductivity in $${\text {Sn}}_{0.7}{\text {Ge}}_{0.3}{\text {Te}}$$ Sn 0.7 Ge 0.3 Te .

Effect of phonon-substrate scattering on lattice thermal conductivity of monolayer MoS2

2020 ◽  
Author(s):  
Sukanya B. Patil ◽  
N. S. Sankeshwar ◽  
B. G. Mulimani
Keyword(s):  
Thermal Conductivity ◽  
Lattice Thermal Conductivity ◽  
Monolayer Mos2

Study of lattice thermal conductivity of tungsten containing bubbles by molecular dynamics simulation

2020 ◽  
Vol 161 ◽  
pp. 112004
Author(s):  
Hongyu Zhang ◽  
Jizhong Sun ◽  
Yingmin Wang ◽  
Thomas Stirner ◽  
Ali Y. Hamid ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Lattice Thermal Conductivity ◽  
Dynamics Simulation
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