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Träfflista för sökning "WFRF:(Kulkova S E) "

Search: WFRF:(Kulkova S E)

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1.
  • Isaeva, L E, et al. (author)
  • Dynamic stability of palladium hydride: An ab initio study
  • 2011
  • In: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY. - : Elsevier Science B.V., Amsterdam.. - 0360-3199. ; 36:1, s. 1254-1258
  • Journal article (peer-reviewed)abstract
    • We present results of our ab initio studies of electronic and dynamic properties of ideal palladium hydride PdH and its vacancy ordered defect phase Pd(3)VacH(4) ("Vac" - vacancy on palladium site) with L1(2) crystal structure found experimentally and studied theoretically. Quantum and thermodynamic properties of these hydrides, such as phonon dispersion relations and the vacancy formation enthalpies have been studied. Dynamic stability of the defect phase Pd(3)VacH(4) with respect to different site occupation of hydrogen atoms at the equilibrium state and under pressure was analyzed. It was shown that positions of hydrogen atoms in the defect phase strongly affect its stability and may be a reason for further phase transitions in the defect phase.
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2.
  • Luo, Hu-Bin, et al. (author)
  • First-principles investigations of the five-layer modulated martensitic structure in Ni(2)Mn(Al(x)Ga(1-x)) alloys
  • 2011
  • In: Acta Materialia. - : Elsevier BV. - 1359-6454 .- 1873-2453. ; 59:15, s. 5938-5945
  • Journal article (peer-reviewed)abstract
    • In this paper, the five-layer modulated (5M) martensitic structures of Ni(2)Mn(Al(x)Ga(1-x)), with x = 0, 0.1 and 0.2, are investigated by the use of the exact muffin-tin orbital method in combination with the coherent potential approximation. The 5M martensite is modeled by varying c/a (shear) and wave-like displacements of the atoms on (1 1 0) plane (shuffle) scaled by eta according to Martynov and Kokorin (J. Phys. III 2, 739 (1992)). For Ni(2)MnGa, we obtain 5M martensite with equilibrium c/a of 0.92 and eta of 0.08, in reasonable agreement with the experiment results (0.94 and 0.06, respectively). c/a and eta are linearly coupled to each other. Al-doping increases c/a and decreases eta, but the linear c/a similar to eta coupling remains. Comparing the total energies of the 5M martensite and L2(1) austenite, we find that the martensite is more stable than the austenite. Al-doping increases the relative stability of the austenite and finally becomes energetically degenerated with the 5M martensite at an Al atomic fraction (x) of about 0.26. The relative phase stability is analyzed based on the calculated density of states. The calculated total magnetic moments mu(0) as a function of c/a exhibit a maximum around the equilibrium c/a. Al-doping reduces mu(0)
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