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- W2135253141 abstract "To clarify the mechanism of formation 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 La2O3 and CaH2 powders were heated in a deoxygenated Ar gas stream and the reduction rate was estimated from the diffraction intensity measured by 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 then examined by XRD, SEM and EPMA.The reduction with CaH2 of 1.7 times the chemical equivalent for the reduction of La2O3 showed that the reduction rate was considerably higher, and that the reaction was completed in about 1 ks from the start of the reaction at 1300 or 1400 K. In the R-D reaction, LaNi5, La2Ni7 and CaNi5 were formed, and the amount of CaNi5 at 1300 K and 1400 K diminished as the reaction proceeded. It was also shown in the R-D reaction for 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 into the CaNi5 layer to form LaNi5. When the amount of CaH2 mixed in a pellet was three times the chemical equivalent for reduction, Ni wires in the pellet were dissolved in Ca melt and their original shapes were not retained. However, with the amount of CaH2 at the chemical equivalent required for reduction, the reaction rate was reduced and the reaction products were LaNi5 and La7Ni16, although no formation of CaNi5 was observed." @default.
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- W2135253141 date "1994-01-01" @default.
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- W2135253141 title "Formation of LaNi<SUB>5</SUB> by Reduction-Diffusion Process with CaH<SUB>2</SUB>" @default.
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- W2135253141 doi "https://doi.org/10.2320/matertrans1989.35.516" @default.
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