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Effects of ball-milling on the hydrogen sorption properties of LaNi 5

Journal of Alloys and Compounds, ISSN: 0925-8388, Vol: 480, Issue: 2, Page: 912-916
2009
  • 31
    Citations
  • 0
    Usage
  • 18
    Captures
  • 0
    Mentions
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    31
    • Citation Indexes
      31
  • Captures
    18

Article Description

Pressure–composition isotherms of LaNi 5 alloys were studied as function of ball-milling time. Results indicate that ball-milling convert a part of the LaNi 5 to a non-absorbing state—a state which does not absorb hydrogen under conditions where un-milled LaNi 5 powders absorb and transform to LaNi 5 H 6, in addition to particle size reduction and creation of defects. The non-absorbing fraction in the milled sample is found to grow with increase in the ball-milling time. The resistance to the hydride formation of the long-time ball-milled LaNi 5 samples is found to continue even after a 1-h high vacuum annealing at around 1000 K. This indicates that the hydrogen-absorption-resist-anomalous state formed during the long-time ball-milling is rather stable.

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