The effect of surface state on the kinetics of cerium-hydride formation
作者： H.T. Bach , T.J. Venhaus , S.N. Paglieri , H. Oona , T.H. Allen
DOI: 10.1016/J.JALLCOM.2007.01.037
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摘要: Abstract We studied the effects of surface oxidation on kinetics hydrogen (H) absorption into two commercial samples Ce: bulk and thin rolled foils. A Sieverts’ apparatus was used to measure H X-ray photoelectron spectroscopy (XPS) determine state presence impurities, notably carbon (C). In as-received condition, Ce specimen covered by a 2 O 3 film (sesquioxide) whereas foil with CeO (dioxide). this rate at room temperature approximately an order magnitude faster in sample than foil. Vacuum annealing P ≤ 1 × 10 −4 Torr T = 773 K significantly increased uptake, making it similar both samples. This reduced so that became more metallic, but produced little change XPS signal from sample. The study suggests differences uptake are affected not only nature oxide (sesquioxide versus dioxide) also integrity film, which may be thermal treatment.
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