Special Issue on Thermodynamic Properties of Crystals and the Rule of Interaction Potentials in Their Prediction

Submission Deadline: Dec. 30, 2015

Please click the link to know more about Manuscript Preparation: http://www.ajphys.org/submission

  • Lead Guest Editor
    • Soulayman Shaher Soulayman
      Department of Applied Physics, Higher Institute for Applied Sciences and Technology, Damascus, Syria
  • Guest Editor
    Guest Editors play a significant role in a special issue. They maintain the quality of published research and enhance the special issue’s impact. If you would like to be a Guest Editor or recommend a colleague as a Guest Editor of this special issue, please Click here to complete the Guest Editor application.
    • Jyhad Attiah
      Faculty of Sciences, Department of Physics, Baath University, Homs, Syria
  • Introduction

    In a crystal, interaction potentials are dominant in calculating the quadratic correlation moment (QCM) and the mean square relative displacements (MSRD) which express the effective amplitudes of atomic vibrations. These quantities hold close relationship to the density fluctuations. The importance of the dynamic correlations is seen in that some melting criteria are defined in terms of the MSRD. The QCM and MSRD have been calculated by the dynamical theory of crystal lattices but these results are valid only at sufficiently low temperature because this theory relies upon the harmonic approximation and the account of anharmonicity on its basis by using perturbation theory is rather complicated. Since then, several other approaches have been developed to take into account the anharmonic effects, among which the most prominent is the self-consistent phonon theory. In this theory, the harmonic force constants are averaged self-consistently over a trial set of harmonic oscillator functions. For low temperatures, it has faced problems with hard-core potentials that were handled by a more adequate treatment of the short-range correlations instead of using a simple cutoff procedure. It should be mentioned as well the simulation techniques widely used in recent years, especially a Monte Carlo formalism in which the quantum mechanical effects are included by making a modification of the potential energy. This formalism has its origin in a previous illustration by Feynman of the use of the path-integral form of the partition function in statistical mechanics, and is known as the method of the effective potential and effective Hamiltonian. The ansymmetrized self-consistent field method ASCFM, is free from the hard-core potential problem and it is based on the assumption that the classical phase probability density or the quantum density matrix is not symmetric with respect to the interchange of coordinates of identical atoms. So, the determination of different potential parameters could not lose its importance with time.

  • Guidelines for Submission

    Manuscripts can be submitted until the expiry of the deadline. Submissions must be previously unpublished and may not be under consideration elsewhere.

    Papers should be formatted according to the guidelines for authors (see: http://www.ajphys.org/submission). By submitting your manuscripts to the special issue, you are acknowledging that you accept the rules established for publication of manuscripts, including agreement to pay the Article Processing Charges for the manuscripts. Manuscripts should be submitted electronically through the online manuscript submission system at http://www.sciencepublishinggroup.com/login. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal and will be listed together on the special issue website.