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Rapid Synthesis of W_18O_49 via Reactive Spark Plasma Sintering with Controlled Anisotropic Thermoelectric Properties
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- Nhat Quang Minh Tran
- Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
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- Ohtaki Michitaka
- Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University Transdisciplinary Research and Education Center for Green Technologies, Kyushu University
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- Suekuni Koichiro
- Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University Transdisciplinary Research and Education Center for Green Technologies, Kyushu University
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Description
Single phase W_18O_49 sintered polycrystalline samples were successfully synthesized via one-step rapid reactive spark plasma sintering directly from commercially purchased WO_3 and WO_2 powders. 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 W_18O_49 materials, 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.
Journal
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- Evergreen
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Evergreen 8 (2), 344-350, 2021-06
Transdiscilinary Research and Education Center for Green Technologies, Kyushu University
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Keywords
Details 詳細情報について
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- CRID
- 1390572175460094592
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- NII Article ID
- 120007099187
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- DOI
- 10.5109/4480715
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- ISSN
- 24325953
- 21890420
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- HANDLE
- 2324/4480715
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- JaLC
- IRDB
- Crossref
- CiNii Articles
- KAKEN
- OpenAIRE
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- Abstract License Flag
- Allowed