Lattice Thermal Conductivity Reduction Due to In Situ-Generated Nano-Phase in Bi0.4Sb1.6Te3 Alloys by Microwave-Activated Hot Pressing

2014 ◽  
Vol 43 (11) ◽  
pp. 4327-4334 ◽  
Author(s):  
Fan Yang ◽  
Xi An Fan ◽  
Zhen Zhou Rong ◽  
Xin Zhi Cai ◽  
Guang Qiang Li
Keyword(s):  
Thermal Conductivity ◽  
Hot Pressing ◽  
Lattice Thermal Conductivity

Enhanced through-plane thermal conductivity in Polymer nanocomposites by constructing graphene-supported BN nanotubes

2020 ◽  
Vol 8 (28) ◽  
pp. 9569-9575
Author(s):  
Xu Li ◽  
Ya Li ◽  
Md Mofasserul Alam ◽  
Jibin Miao ◽  
Peng Chen ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Polymer Nanocomposites ◽  
Hot Pressing ◽  
High Thermal Conductivity ◽  
Bn Nanotubes

A graphene-supported BNNT filler is fabricated via the in situ implanting of BNNTs on graphene, with the formation of high thermal conductivity nanocomposites via hot-pressing.

Preferential phonon scattering and low energy carrier filtering by interfaces of in situ formed InSb nanoprecipitates and GaSb nanoinclusions for enhanced thermoelectric performance of In0.2Co4Sb12

2020 ◽  
Vol 49 (44) ◽  
pp. 15883-15894
Author(s):  
Sanyukta Ghosh ◽  
Gyan Shankar ◽  
Anirudha Karati ◽  
Gerda Rogl ◽  
Peter Rogl ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Lattice Thermal Conductivity ◽  
Phonon Scattering ◽  
Energy Carrier ◽  
Low Energy ◽  
Thermoelectric Performance

The dispersion of GaSb and InSb nanoinclusions in In-filled Co4Sb12 results in low lattice thermal conductivity and high thermoelectric performance.

Spinodal Decomposition in Off-stoichiometric Zr0.5Hf0.5Co1-yIrySb1-zSnz half-Heusler Phases

2010 ◽  
Vol 1267 ◽  
Author(s):  
Nathan J. Takas ◽  
Dinesh Misra ◽  
Heike Gabrisch ◽  
Pierre F. P. Poudeu
Keyword(s):  
Thermal Conductivity ◽  
Spinodal Decomposition ◽  
Lattice Thermal Conductivity ◽  
Large Fraction ◽  
High Energy ◽  
Metallic Phase ◽  
Inclusion Phase ◽  
The Matrix ◽  
Energy Ball

AbstractThe formation of nanostructures within the matrix of half-Heusler thermoelectric materials can be produced by spinodal decomposition of off-stoichiometric compositions. CoSb is insoluble at high temperatures in Zr0.5Hf0.5Co1-yIrySb1-zSnz half-Heusler phases. This phase can be solubilized into the half-Heusler matrix by the use of high energy ball milling at room temperature as the synthetic method of choice. The metastable half-Heusler material decomposes in-situ while hot-pressing the powder sample into a compact pellet. Despite the fact that the thermal conductivity of the inclusion material, CoSb, is very large, (>35W/m•K), we observed reduction in the lattice thermal conductivity of the composite material. Furthermore, the electrical resistivity of the specimen was also reduced due to the metallic nature of the CoSb inclusion phase. Addition of a large fraction of the metallic inclusion leads to a percolation network of the metallic phase, thus reducing the Seebeck coefficient of the composites. Electron microscopy is carried out in order to examine boundaries between the two. Changes in the thermoelectric properties of Zr0.5Hf0.5Co1-yIrySb1-zSnz half-Heusler matrix with increasing mass percent of CoSb inclusion will be discussed.

Low-Temperature Thermoelectric Properties of Zn4Sb3 Prepared by Hot Pressing

2006 ◽  
Vol 510-511 ◽  
pp. 1070-1073 ◽  
Author(s):  
Il Ho Kim ◽  
J.B. Park ◽  
Tae Whan Hong ◽  
Soon Chul Ur ◽  
Young Geun Lee ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermoelectric Properties ◽  
Hot Pressing ◽  
Figure Of Merit ◽  
Lattice Thermal Conductivity ◽  
Phonon Scattering ◽  
Thermoelectric Figure Of Merit ◽  
Total Thermal Conductivity ◽  
Thermoelectric Figure ◽  
Scattering Centers

Zn4Sb3 was successfully produced by a hot pressing technique, and its thermoelectric properties were investigated in the temperature range from 4K to 300K. The Seebeck coefficient, electrical conductivity, thermal conductivity, and thermoelectric figure of merit showed a discontinuity in variation at 242K, indicating the α-Zn4Sb3 to β-Zn4Sb3 phase transformation. Lattice thermal conductivity was found to be dominant in the total thermal conductivity of Zn4Sb3. Therefore, it is expected that thermoelectric properties can be improved by reducing the lattice thermal conductivity inducing phonon scattering centers.

scholarly journals Investigation of the Microstructural and Thermoelectric Properties of the(GeTe)0.95(Bi2Te3)0.05Composition for Thermoelectric Power Generation Applications

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Lior Weintraub ◽  
Joseph Davidow ◽  
Jonathan Tunbridge ◽  
Richard Dixon ◽  
Michael John Reece ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Power Generation ◽  
Thermoelectric Power ◽  
Thermoelectric Properties ◽  
Process Parameters ◽  
Hot Pressing ◽  
Lattice Thermal Conductivity ◽  
Microstructural Characteristics ◽  
Powder Particles ◽  
Very High

In the frame of the current research, thep-type Bi2Te3doped (GeTe)0.95(Bi2Te3)0.05alloy composed of hot pressed consolidated submicron structured powder was investigated. The influence of the process parameters (i.e., powder particles size and hot pressing conditions) on both reduction of the lattice thermal conductivity and electronic optimization is described in detail. Very high maximalZTvalues of up to∼1.6 were obtained and correlated to the microstructural characteristics. Based on the various involved mechanisms, a potential route for further enhancement of theZTvalues of the investigated composition is proposed.

In Situ Nanostructure Generation and Evolution within a Bulk Thermoelectric Material to Reduce Lattice Thermal Conductivity

Nano Letters ◽  
2010 ◽  
Vol 10 (8) ◽  
pp. 2825-2831 ◽  
Author(s):  
Steven N. Girard ◽  
Jiaqing He ◽  
Changpeng Li ◽  
Steven Moses ◽  
Guoyu Wang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermoelectric Material ◽  
Lattice Thermal Conductivity

In situ formation of a cellular graphene framework in thermoplastic composites leading to superior thermal conductivity

2017 ◽  
Vol 5 (13) ◽  
pp. 6164-6169 ◽  
Author(s):  
Fakhr E. Alam ◽  
Wen Dai ◽  
Minghui Yang ◽  
Shiyu Du ◽  
Xinming Li ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Hot Pressing ◽  
Single Step ◽  
Thermoplastic Composites ◽  
In Situ Formation

With single-step hot-pressing processes, a remarkable enhancement of the thermal conductivity of graphene/thermoplastic composites has been achieved, based on the formation of an interconnected, thermally percolating graphene framework in their matrix.

scholarly journals Fabrication, Microstructure, and Properties of In Situ V2C-Reinforced Copper Composites

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1829
Author(s):  
Yu Quan ◽  
Baotong Hu ◽  
Shuai Fu ◽  
Detian Wan ◽  
Yiwang Bao ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Tensile Strength ◽  
Vickers Hardness ◽  
Hot Pressing ◽  
Physical And Mechanical Properties ◽  
Microstructure And Properties

In this paper, in situ V2C-reinforced Cu composites were successfully fabricated by hot pressing at 750 °C under 25 MPa using Cu and V2SnC powders. Due to decomposition of V2SnC to V2C and Sn during sintering, Sn atoms entered the crystal structure of Cu. Therefore, final compositions of composites consisted of Cu(Sn) and V2C phases. Here, copper composites with 0, 5, 10, 20, and 30 vol.% V2C were designed. Their microstructures and physical and mechanical properties were systematically investigated. It was observed that with increasing V2C content, electrical conductivity decreased from 0.589 × 108 S·m−1 to 0.034 × 108 S·m−1 and thermal conductivity decreased from 384.36 W⋅m−1⋅K−1 to 24.65 W·m−1·K−1, while Vickers hardness increased from 52.6 HV to 334 HV. Furthermore, it was found that composites with 20 vol.% V2C had the highest tensile strength (440 MPa).

scholarly journals Facile in situ solution synthesis of SnSe/rGO nanocomposites with enhanced thermoelectric performance

2020 ◽  
Vol 8 (3) ◽  
pp. 1394-1402 ◽  
Author(s):  
Lisi Huang ◽  
Jianzhang Lu ◽  
Duowen Ma ◽  
Chunmiao Ma ◽  
Bin Zhang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Solution Method ◽  
Lattice Thermal Conductivity ◽  
Thermoelectric Performance ◽  
Solution Synthesis

SnSe/rGO nanocomposites can be synthesised in situ via a facile solution method; once sintered, the lattice thermal conductivity and ZT of the composites are significantly reduced and enhanced respectively compared to SnSe itself.

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