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

doi:10.1016/j.jallcom.2009.05.117

Phase transformation of the La_0.7Mg_0.3Ni_2.8Co_0.5-H₂ system studied by in situ X-ray diffraction

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

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

Phase transformation in the La_0.7Mg_0.3Ni_2.8Co_0.5-H₂ system along the hydrogen absorption and desorption pressure-composition isotherm was studied using in situ X-ray diffraction. La_0.7Mg_0.3Ni_2.8Co_0.5 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 language	English
Pages (from-to)	174-180
Number of pages	7
Journal	Journal of Alloys and Compounds
Volume	485
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2009.05.117
Publication status	Published - Oct 19 2009
Externally published	Yes

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2009.05.117

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

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.",

author = "Yujun Chai and Kohta Asano and Kouji Sakaki and Hirotoshi Enoki and Etsuo Akiba",

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AU - Chai, Yujun

AU - Asano, Kohta

AU - Sakaki, Kouji

AU - Enoki, Hirotoshi

AU - Akiba, Etsuo

PY - 2009/10/19

Y1 - 2009/10/19

N2 - 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.

AB - 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.

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Phase transformation of the La_0.7Mg_0.3Ni_2.8Co_0.5-H₂ system studied by in situ X-ray diffraction

Abstract

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