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- W2607180346 abstract "To clarify the formation mechanism of La-Ni compounds by the reduction-diffusion (R-D) process, the reduction of La2O3 by CaH2 and the R-D reaction to form La-Ni compounds were carried out at 1200, 1300 and 1400 K. In the reduction experiment, pellets of mixed powders of La2O3 and CaH2 were heated in a deoxygenated Ar gas stream and the reduction rate was estimated from the intensity measurement with XRD. In the R-D experiment, La2O3 and CaH2 were mixed with Ni powder or Ni wires and pressed into pellets, and the reacted samples were examined with XRD, SEM and EPMA.The reduction with CaH2 1.7 times as much as the chemical equivalent for the reduction of La2O3 revealed that the reduction rate was considerably high and the reaction was completed in 0.5 to 1.0 ks from the start of the reaction at 1300 or 1400 K. In the R-D reaction for the samples containing Ni powder, LaNi5, La2Ni7 and CaNi5 were formed, and the CaNi5 at 1300 and 1400 K was diminished as the reaction proceeded. It was also proved in the R-D reaction for the pellets containing Ni wires that a double-layer of CaNi5 and LaNi5 was formed on the surface of each Ni wire and that La diffused in the CaNi5 layer to form LaNi5. When the amount of CaH2 mixed in a pellet was 3 times as much as the chemical equivalent for reduction, Ni wires in the pellet were dissolved in Ca melt and their original shapes was not retained. In the case of the amount of CaH2 just as much as the chemical equivalent for reduction, on the other hand, the reaction rate was lowered and the reaction products were LaNi5 and La7Ni16, though the formation of CaNi5 was not observed." @default.
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- W2607180346 date "1994-01-01" @default.
- W2607180346 modified "2023-10-02" @default.
- W2607180346 title "Formation of La-Ni Intermetallic Compounds by Reduction-Diffusion Process" @default.
- W2607180346 doi "https://doi.org/10.2320/jinstmet1952.58.2_182" @default.
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