Temperature dependence of the elastic moduli of polycrystalline LaAl xNi5-x and LaSnxNi5-x

J. E. Atteberry, D. S. Agosta, C. E. Nattrass, R. G. Leisure, I. Jacob, R. C. Bowman, O. Yeheskel

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14 Scopus citations


The elastic moduli of the polycrystalline intermetallic compounds LaAl xNi5-x (x = 0, 0.25, 0.50 and 1.00) have been measured over the temperature range 3-415K and those of LaSnxNi5-x (x = 0.10, 0.22, 0.40 and 0.50) over the temperature range 65-400K. The samples were prepared by a hot isostatic pressing technique and had near theoretical densities with porosities ranging from 0 to 2%. In order to compare values for different concentrations small corrections were made for porosity so that values expected for the theoretical density were found. The temperature dependence of the moduli resembles that of ordinary metals; the moduli approach zero temperature with zero slope and decrease monotonically with increasing temperature at higher temperatures. Poisson's ratio is almost temperature-independent increasing from 0.307 for LaNi5 at low temperatures to 0.313 at 415K. The acoustic contribution to the low-temperature specific heat, calculated from the elastic moduli measured at 3K, ranges from 2.21×10-4T3 to 2.31×10-4T3J/ (molK4) for the aluminum alloys. The corresponding Debye temperatures range from 370 to 375K.

Original languageEnglish
Pages (from-to)139-144
Number of pages6
JournalJournal of Alloys and Compounds
Issue number1-2
StatePublished - 11 Aug 2004


  • Elasticity
  • Hydrogen storage materials
  • Ultrasonics

ASJC Scopus subject areas

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


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