Phase transformation of the La0.7Mg0.3Ni2.8Co0.5-H2 system studied by in situ X-ray diffraction

Yujun Chai, Kohta Asano, Kouji Sakaki, Hirotoshi Enoki, Etsuo Akiba

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Abstract

Phase transformation in the La0.7Mg0.3Ni2.8Co0.5-H2 system along the hydrogen absorption and desorption pressure-composition isotherm was studied using in situ X-ray diffraction. La0.7Mg0.3Ni2.8Co0.5 consisted mainly of the Ce2Ni7-type La3Mg(Ni,Co)14 phase. In hydrogen absorption of the Ce2Ni7-type phase, the hydrogen solid solution and hydride phases coexisted. The solid solution phase transformed to the hydride phase with isotropic expansion of the crystal lattice. In hydrogen desorption, coexistence of the two phases was not observed and the crystal lattice consecutively reduced with reduction of the hydrogen content. Lattice strain in the Ce2Ni7-type phase in hydrogen desorption was higher than that in hydrogen absorption.

Original languageEnglish
Pages (from-to)174-180
Number of pages7
JournalJournal of Alloys and Compounds
Volume485
Issue number1-2
DOIs
Publication statusPublished - Oct 19 2009

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All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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