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- W1976004046 abstract "Abstract Surface reactions between a (0 0 0 1) C -plane sapphire and NH 3 , with He as an inert carrier gas, were investigated at high temperatures over 1200 °C using the in situ gravimetric monitoring method. Although the sapphire substrate was stable up to 1400 °C under a He atmosphere, decomposition started to occur at 1300 °C under a 0.1 atm NH 3 +He and the decomposition rates were found to be lower than those in 0.1 atm H 2 +He at each temperature. These results imply that sapphire can be decomposed by NH 3 and/or hydrogen generated by the decomposition of NH 3 over 1300 °C. The decomposition rate in NH 3 +He was decreased with increase in NH 3 flow time, and the decomposition rate became constant after 60 min of NH 3 flow. Moreover, the activation energy for sapphire decomposition before 60 min of NH 3 flow was different from that after 60 min of NH 3 flow time, which indicates that the surface reaction between sapphire and NH 3 and/or hydrogen generated from NH 3 changes depending on the time of NH 3 flow. The dependence of the surface reactions and rate-limiting reactions between sapphire and NH 3 on the time of NH 3 flow is discussed." @default.
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- W1976004046 date "2009-05-01" @default.
- W1976004046 modified "2023-10-16" @default.
- W1976004046 title "In situ gravimetric monitoring of surface reactions between sapphire and NH3" @default.
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- W1976004046 doi "https://doi.org/10.1016/j.jcrysgro.2009.01.079" @default.
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