Journal
MATERIALS TRANSACTIONS
Volume 52, Issue 4, Pages 586-590Publisher
JAPAN INST METALS
DOI: 10.2320/matertrans.MA201004
Keywords
hydrogen storage; BCC solid-solution alloy; phase transformation; lattice strain; X-ray diffraction
Funding
- New Energy and Industrial Technology Development Organization (NEDO) under Advanced Fundamental Research on Hydrogen Storage Materials (HYDRO-STAR)
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We used powder X-ray diffraction (XRD) and Rietveld refinement to study phase transformation and the lattice strain introduced into each hydride phase of Ti1.0V1.1Mn0.9 during first absorption and desorption. Hydrogenation proceeded from a solid-solution phase to a dihydride phase via a monohydride phase. Each single-phase region was observed beside two clear plateau regions on the pressure-composition (P-C) isotherm. In contrast, the desorption P-C isotherm showed only one clear plateau, corresponding to a two-phase region of the dihydride and the monohydride. The plateau was connected to a two-phase region of the monohydride and a solid-solution phase, and to another region of solid-solution phases. The monohydride single-phase region was not clearly observed during desorption. Isotropic lattice strain was introduced, and increased with phase transformation during the first absorption. The strain increased further in the subsequent phase transformation during desorption, particularly upon formation of a solid-solution phase. [doi:10.2320/matertrans.MA201004]
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