The investigation of the Zr1-yTiy(Cr1-xNix) 2-H2 system 0.0≤y≤1.0 and 0.0≤x≤1.0 Phase composition analysis and thermodynamic properties

M. Bououdina, H. Enoki, Etsuo Akiba

研究成果: Contribution to journalArticle査読

28 被引用数 (Scopus)

抄録

The Zr1-yTiy(Cr1-xNix)2 compounds were synthesized and characterized by means of X-ray powder diffraction. From the Rietveld analysis carried out on the alloys, we determined the phase abundancy and refined the crystal structure. The system crystallized with hexagonal C14-type structure for nickel content less than x=1.0 with some amount of additional phases (ZrNi, Zr9Ni11, Zr7Ni10, TiNi) and pure metals (Ni and Cr). For higher nickel concentrations, the system crystallized in the cubic C15-type structure. The amount of additional phases increased with increasing nickel and titanium content. The Pressure-Composition-Temperature measurements using a volumetric method were carried out at 313 K on some selected alloys. The single phase systems were found to absorb a large amount of hydrogen (H/M≤1.8 wt.%) but had very poor kinetics. The multiphase systems were found to behave as a single phase (presence of single plateau), have a relatively good hydrogen capacity (H/M≤1.4 wt.%) and exhibit faster kinetics. A linear correlation between the heat of formation of the Zr1-yTiy(Cr1-xNix)2 hydrides estimated from the band structure model and the unit cell volume of the alloys determined from the X-ray Rietveld analysis was obtained. It shows a decrease of hydride stability with increasing unit cell volume.

本文言語英語
ページ(範囲)290-300
ページ数11
ジャーナルJournal of Alloys and Compounds
281
2
DOI
出版ステータス出版済み - 12 18 1998

All Science Journal Classification (ASJC) codes

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

フィンガープリント 「The investigation of the Zr<sub>1-y</sub>Ti<sub>y</sub>(Cr<sub>1-x</sub>Ni<sub>x</sub>) <sub>2</sub>-H<sub>2</sub> system 0.0≤y≤1.0 and 0.0≤x≤1.0 Phase composition analysis and thermodynamic properties」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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