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- Synthesis of W18O49 Phase by Carbothermal Reduction of Tungsten Oxide and its Field Emission Characteristics
- Hyo-Seung Yang, Hoon Park, Hyoung-chul Kim, Jae-Pyoung Ahn, Moo-Young Huh, Jong-Ku Park
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Journal of Korean Powder Metallurgy Institute 2004;11(3):253-258
DOI: https://doi.org/10.4150/KPMI.2004.11.3.253
1Nano-Materials Research Center, Korea Institute of Science and Technology, Division of Materials Science and Engineering, Korea University
2Nano-Materials Research Center, Korea Institute of Science and Technolog
3Nano-Materials Research Center, Korea Institute of Science and Technolog
4Nano-Materials Research Center, Korea Institute of Science and Technolog
5Division of Materials Science and Engineering, Korea University
6Nano-Materials Research Center, Korea Institute of Science and Technology
2Nano-Materials Research Center, Korea Institute of Science and Technolog
3Nano-Materials Research Center, Korea Institute of Science and Technolog
4Nano-Materials Research Center, Korea Institute of Science and Technolog
5Division of Materials Science and Engineering, Korea University
6Nano-Materials Research Center, Korea Institute of Science and Technology
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Abstract
We report a carbothermal reduction process for massive synthesis of monolithic W_18O_49 phase from tungsten oxide in the presence of carbon source. Carbon black powder was used as a carbon source and added to WO_3 by 40 weight percent. Bundles of W_18O_49 rods were formed over the temperature range of 800°C°C to 900°C. Pure W_18O_49 bundles could be separated from the mixture of W_18O_49 and residual carbon black powder. Field emission character of W_18O_49 phase was determined using the extracted W_18O_49 rods. Flat lamp fabricated from the W_18O_49 rods showed the turn-on field of 9.3 V/µm.
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