TY - JOUR
T1 - Rapid synthesis of W18O49via reactive spark plasma sintering with controlled anisotropic thermoelectric properties
AU - Tran, Nhat Quang Minh
AU - Ohtaki, Michitaka
AU - Suekuni, Koichiro
N1 - Funding Information:
The authors would like to thank Dr. S. Hirata, Mr. W. Klich, Ms. S. Maneeyom, and Ms. B.T. Nguyen for their valuable discussion. This work was supported by JSPS KAKENHI Grant Number JP19H02800.
Publisher Copyright:
© 2021 Novel Carbon Resource Sciences. All rights reserved.
PY - 2021/6
Y1 - 2021/6
N2 - Single phase W18O49sintered polycrystalline samples were successfully synthesized via one-step rapid reactive spark plasma sintering directly from commercially purchased WO3and WO2powders. Thermoelectric properties of the samples sintered at 15 and 30 MPa showed insignificant anisotropy, while a strong anisotropy was observed for the sample sintered at 50 MPa. The in-situ reaction under a high applied pressure allowed a preferential grain growth along the direction perpendicular to the pressure axis. The high anisotropy of the sample sintered at 50 MPa yielded the lowest thermal conductivity of 4 Wm-1K-1, resulting in a ZT value of 0.08 at 1073 K. This study offers the rapid and cost-effective preparation method for W18O49materials, which can also be applied for other tungsten suboxide phases, with partially controlled anisotropic properties by the influence of applied pressure for thermoelectric performance enhancement.
AB - Single phase W18O49sintered polycrystalline samples were successfully synthesized via one-step rapid reactive spark plasma sintering directly from commercially purchased WO3and WO2powders. Thermoelectric properties of the samples sintered at 15 and 30 MPa showed insignificant anisotropy, while a strong anisotropy was observed for the sample sintered at 50 MPa. The in-situ reaction under a high applied pressure allowed a preferential grain growth along the direction perpendicular to the pressure axis. The high anisotropy of the sample sintered at 50 MPa yielded the lowest thermal conductivity of 4 Wm-1K-1, resulting in a ZT value of 0.08 at 1073 K. This study offers the rapid and cost-effective preparation method for W18O49materials, which can also be applied for other tungsten suboxide phases, with partially controlled anisotropic properties by the influence of applied pressure for thermoelectric performance enhancement.
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U2 - 10.5109/4480715
DO - 10.5109/4480715
M3 - Article
AN - SCOPUS:85110572120
VL - 8
SP - 344
EP - 350
JO - Evergreen
JF - Evergreen
SN - 2189-0420
IS - 2
ER -