- Synthesis of W18O49 Phase by Carbothermal Reduction of Tungsten Oxide and its Field Emission Characteristics
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Hyo-Seung Yang, Hoon Park, Hyoung-chul Kim, Jae-Pyoung Ahn, Moo-Young Huh, Jong-Ku Park
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J Korean Powder Metall Inst. 2004;11(3):253-258.
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DOI: https://doi.org/10.4150/KPMI.2004.11.3.253
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 Abstract
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- 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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