Abstract
Abstract The temperature and concentration dependences of the short-range order (SRO) parameters and their Fourier transform in H subsystem distributed on the octahedral interstices of fcc Ni are analysed, taking into account both direct (electrochemical) and indirect (strain-induced) contributions into the H-H interaction. The parameters of the electrochemical H-H interaction are estimated within the framework of the semiempirical approximation for atom-atom potentials. In order to calculate the energy parameters of the H-H strain-induced intraction, the Matsubara-Kanzaki-Krivoglaz lattice-statics method is applied. We demonstrate that, in the framework of the considered model, the strain-induced part mainly contributes to the total H-H interatomic mixing potential. For a description of the H-H SRO, the high-accuracy analytical (so-called ring) approximation is used. It is revealed that, for all considered values of the H concentration c = 0.10. 0.25 and 0.50. the H-H SRO Fourier transform is characteriz...
Published Version
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