Synthesis and structural study of Ti-rich Mg-Ti hydrides

Kohta Asano, Hyunjeong Kim, Kouji Sakaki, Katharine Page, Shigenobu Hayashi, Yumiko Nakamura, Etsuo Akiba

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Abstract

MgxTi1-x (x = 0.15, 0.25, 0.35) alloys were synthesized by means of ball milling. Under a hydrogen pressure of 8 MPa at 423 K these Mg-Ti alloys formed a hydride phase with a face centered cubic (FCC) structure. The hydride for x = 0.25 consisted of single Mg 0.25Ti0.75H1.62 FCC phase but TiH2 and MgH2 phases were also formed in the hydrides for x = 0.15 and 0.35, respectively. X-ray diffraction patterns and the atomic pair distribution function indicated that numbers of stacking faults were introduced. There was no sign of segregation between Mg and Ti in Mg0.25Ti 0.75H1.62. Electronic structure of Mg 0.25Ti0.75H1.62 was different from those of MgH2 and TiH2, which was demonstrated by 1H nuclear magnetic resonance. This strongly suggested that stable Mg-Ti hydride phase was formed in the metal composition of Mg0.25Ti0.75 without disproportion into MgH2 and TiH2.

Original languageEnglish
Pages (from-to)132-136
Number of pages5
JournalJournal of Alloys and Compounds
Volume593
DOIs
Publication statusPublished - Apr 25 2014

All Science Journal Classification (ASJC) codes

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

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    Asano, K., Kim, H., Sakaki, K., Page, K., Hayashi, S., Nakamura, Y., & Akiba, E. (2014). Synthesis and structural study of Ti-rich Mg-Ti hydrides. Journal of Alloys and Compounds, 593, 132-136. https://doi.org/10.1016/j.jallcom.2014.01.061