Sn-substituted LaNi{sub 5} alloys for metal hydride electrodes

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Description

This research examines the efficacy of tin additions to LaNi{sub 5} in improving the hydrogen storage capacity of the material during charging/discharging. Alloys were prepared using high energy ball milling (mechanical alloying), a technique superior to arc casting for alloying elements with a wide disparity in melting points. Characterization by X-ray diffraction and Rietveld analysis shows that tin preferentially occupies the Ni(3g) sites in the LaNi{sub 5} structure, and the unit cell volume increases linearly with tin content to the maximum tin solubility of 7.33 atomic percent (LaNi{sub 4.56}Sn{sub 0.44}). The authors found that powders prepared by mechanical alloying and ... continued below

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7 p.

Creation Information

Wasz, M.L.; Schwarz, R.B.; Srinivasan, S. & Sridhar Kumar, M.P. May 1, 1995.

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Description

This research examines the efficacy of tin additions to LaNi{sub 5} in improving the hydrogen storage capacity of the material during charging/discharging. Alloys were prepared using high energy ball milling (mechanical alloying), a technique superior to arc casting for alloying elements with a wide disparity in melting points. Characterization by X-ray diffraction and Rietveld analysis shows that tin preferentially occupies the Ni(3g) sites in the LaNi{sub 5} structure, and the unit cell volume increases linearly with tin content to the maximum tin solubility of 7.33 atomic percent (LaNi{sub 4.56}Sn{sub 0.44}). The authors found that powders prepared by mechanical alloying and not exposed to air require no activation to induce hydrogen absorption. The hydrogen storage capacity in the gas and electrochemical phase was measured as a function of tin content. They found that with increasing tin, the plateau pressure decreases logarithmically, whereas the hydrogen storage capacity decreases linearly.

Physical Description

7 p.

Notes

OSTI as DE95012059

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  • Spring meeting of the Materials Research Society (MRS), San Francisco, CA (United States), 17-21 Apr 1995

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  • Other: DE95012059
  • Report No.: LA-UR--95-1370
  • Report No.: CONF-950412--10
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/72884 | External Link
  • Office of Scientific & Technical Information Report Number: 72884
  • Archival Resource Key: ark:/67531/metadc703854

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  • May 1, 1995

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  • Sept. 12, 2015, 6:31 a.m.

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  • Feb. 26, 2016, 5:44 p.m.

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Wasz, M.L.; Schwarz, R.B.; Srinivasan, S. & Sridhar Kumar, M.P. Sn-substituted LaNi{sub 5} alloys for metal hydride electrodes, report, May 1, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc703854/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.