PL EN


Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników
Czasopismo
2012 | 10 | 1 | 86-95
Tytuł artykułu

On the thermodynamics of phase transitions in metal hydrides

Autorzy
Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Metal hydrides are solutions of hydrogen in a metal, where phase transitions may occur depending on temperature, pressure etc. We apply Le Chatelier’s principle of thermodynamics to a particular phase transition in TiHx, which can approximately be described as a second-order phase transition. We show that the fluctuations of the order parameter correspond to fluctuations both of the density of H+ ions and of the distance between adjacent H+ ions. Moreover, as the system approaches the transition and the correlation radius increases, we show -with the help of statistical mechanics-that the statistical weight of modes involving a large number of H+ ions (‘collective modes’) increases sharply, in spite of the fact that the Boltzmann factor of each collective mode is exponentially small. As a result, the interaction of the H+ ions with collective modes makes a tiny suprathermal fraction of the H+ population appear. Our results hold for similar transitions in metal deuterides, too. A violation of an -insofar undisputed-upper bound on hydrogen loading follows.
Wydawca

Czasopismo
Rocznik
Tom
10
Numer
1
Strony
86-95
Opis fizyczny
Daty
wydano
2012-02-01
online
2011-12-03
Twórcy
autor
Bibliografia
  • [1] DOE - Hydrogen Program - 2010 Annual Progress Report
  • [2] A. De Ninno, A. La Barbera, V. Violante, J. Alloy Compd. 181, 253 (1997)
  • [3] A. J. Leggett, G. Baym, Nature 340, 45 (1989) http://dx.doi.org/10.1038/340045a0[Crossref]
  • [4] L. D. Landau, E. M. Lifschitz, Electrodynamics of continuous media (Pergamon, Oxford, 1960)
  • [5] A. V. der Ven, Q. Xu, J. Bhattacharya, First-principles prediction of hydride phase stability and the thermodynamics of decohesion, In: B. Somerday, P. Sofronis, R. Jones (Eds.), Proceedings of the 2008 intl. hydrogen conference - effects of hydrogen on materials, Sept. 7–10, 2008, Jackson Lake Lodge, Grand Teton National Park, Wyoming, USA (ASM International, New York 2008)
  • [6] V. I. Ivaschenko, L. A. Ivashchenko, P. L. Srynskij, L. A. Grishnov, A. I. Stepny, In: B. Berenovsky, S. Y. Zaginaichenko, D. Vischur (Eds.), Carbon nanomaterials in clean energy hydrogen systems (Springer, Berlin, 2008)
  • [7] I. S. Anderson, D. K. Ross, Phys. Lett. A 68, 249 (1978) http://dx.doi.org/10.1016/0375-9601(78)90819-8[Crossref]
  • [8] D. M. Nace, J. G. Aston, J. Am. Chem. Soc. 79, 14 3627 (1957)
  • [9] R. Schwarz, A. Khachaturyan, D. Safarik, In: B. Somerday, P. Sofronis, R. Jones (Eds.), Proceedings of the 2008 intl. hydrogen conference - effects of hydrogen on materials, Sept. 7–10, 2008, Jackson Lake Lodge, Grand Teton National Park, Wyoming, USA (ASM International, New York 2008)
  • [10] B. J. Heuser, J. S. King, W. C. Chen, J. Alloy Compd. 292, 134 (1999) http://dx.doi.org/10.1016/S0925-8388(99)00256-X[Crossref]
  • [11] W. C. Chen, B. J. Heuser, J. S. King, J. Appl. Crystallogr. 33, 442 (2000) http://dx.doi.org/10.1107/S0021889899013667[Crossref]
  • [12] L. D. Landau, E. M. Lifschitz, Statistical physics (Oxford, Pergamon, 1958)
  • [13] L. D. Landau, E. M. Lifschitz, Theory of elasticity (Oxford, Pergamon, 1960)
  • [14] G. A. Korn, T. M. Korn Mathematical handbook for scientists and engineers (McGraw-Hill, New York, 1968)
  • [15] S. A. Semiletov, R. V. Baranova, Y. P. Khodyrev, R. socM. Imamov, Sov. Phys. Crystallogr. 25,6, 865 1980)
  • [16] R. V. Baranova, Yu. P. Khodyrev, R. M. Imamov, S.A. Semiletov, Sov. Phys. Crystallogr. 25, 736 (1980)
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_s11534-011-0094-4
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.