Phase transformation and lattice-strain formation in Ti1.0V1.1Mn0.9 during first absorption and desorption

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  • Yamazaki Saishun
    National Institute of Advanced Industrial Science and Technology (AIST)
  • Nakamura Jin
    National Institute of Advanced Industrial Science and Technology (AIST)
  • Sakaki Kouji
    National Institute of Advanced Industrial Science and Technology (AIST)
  • Nakamura Yumiko
    National Institute of Advanced Industrial Science and Technology (AIST)
  • Akiba Etsuo
    National Institute of Advanced Industrial Science and Technology (AIST)

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  • Phase Transformation and Lattice-Strain Formation in Ti<SUB>1.0</SUB>V<SUB>1.1</SUB>Mn<SUB>0.9</SUB> during First Absorption and Desorption

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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.

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