Calorimetric properties of C14 and C15 YMn2 and YMn 2(H,D)6

R. S. Liu, I. Baginskiy, H. T. Kuo, S. M. Filipek, R. Wierzbicki, R. Sato, A. V. Tsvyashchenko, L. Fomicheva, H. H. Wu, C. B. Tsai, C. C. Yang, R. Asmatulu, J. C. Ho, Y. Y. Chen

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The capacity of YMn2 to undergo reversible hydrogenization makes this compound a potential candidate for hydrogen storage. This report describes the successful synthesis of YMn2H6 from hexagonal C14 YMn2 as well as calorimetric studies of hexagonal C14 YMn 2, cubic C15 YMn2 and their isostructural derivatives, YMn2H6 and YMn2D6. Complementary structural and physical property characterizations include X-ray diffraction, electrical resistivity, and magnetic susceptibility measurements. Of particular interest is a hysteretic first-order phase transition in C15 YMn2 near 100 K, which does not occur in C14 YMn2. Analysis of a specific heat anomaly that is associated with this transition reveals a substantial latent heat of 330 J/mol. No such anomalous specific heat exists in YMn 2D6, suggesting that the transition is suppressed upon deuterization.

Original languageEnglish
Pages (from-to)2285-2290
Number of pages6
JournalInternational Journal of Hydrogen Energy
Issue number3
StatePublished - Feb 2011


  • Calorimetry
  • Deuterization
  • Hydrogen
  • Latent heat
  • YMn


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