Hydrogen absorbing properties and crystal structure of Ti-V-Mn solid solution alloys

Yumiko Nakamura, Etsuo Akiba

Research output: Contribution to conferencePaper

Abstract

Hydriding properties and crystal structure of a Ti-V-Mn solid solution alloy have been studied by P-C isotherm measurements and neutron and X-ray powder diffraction. The absorption P-C isotherm at 298K shows two plateau regions at 0.01MPa and 1MPa. The X-ray diffraction data have demonstrated that three phases with a BCC, a pseudo-cubic FCC and an FCC structure form subsequently with increase of the hydrogen content. Crystal structure of the latter two phases has been determined by Rietveld refinement of the neutron diffraction data. The FCC phase is the di-hydride of CaF2type with hydrogen occupation in the T sites. The pseudo-cubic FCC phase is the mono-hydride of NaCl-type with hydrogen occupation in the O sites, which has not been reported so far. The lattice constants of the mono-hydride (Ti1.0V1.1Mn0.9)H-2.7 are a'=0.407 nm for two axes and c'=0.390 nm for the third axis. The a'axis is shorter by 4% than the c'axis. This pseudocubic FCC lattice is formed by contraction of 5% of the a axis and expansion of about 30% of the c axis from the original BCC lattice.

Original languageEnglish
Pages109-120
Number of pages12
Publication statusPublished - Jan 1 2002
EventEPD Congress 2002 on Fundamentals of Advanced Materials for Energy Conversion - Seattle, WA, United States
Duration: Feb 17 2002Feb 21 2002

Other

OtherEPD Congress 2002 on Fundamentals of Advanced Materials for Energy Conversion
CountryUnited States
CitySeattle, WA
Period2/17/022/21/02

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Cite this

Nakamura, Y., & Akiba, E. (2002). Hydrogen absorbing properties and crystal structure of Ti-V-Mn solid solution alloys. 109-120. Paper presented at EPD Congress 2002 on Fundamentals of Advanced Materials for Energy Conversion, Seattle, WA, United States.