Lattice fluid with attractive interaction between nearest neighbors and repulsive interaction between next-next-nearest neighbors on simple cubic lattice

  • Yaroslav G. Groda Belarusian State Technological University, 13a Sviardlova Street, Minsk 220006, Belarus
  • Vyacheslav S. Vikhrenko Belarusian State Technological University, 13a Sviardlova Street, Minsk 220006, Belarus
  • Dung di Caprio National Graduate School of Chemistry, 11 Pierre and Marie Curie Street, Paris 75005, France https://orcid.org/0000-0001-6239-7427

Abstract

The lattice system with competing interactions (attractive between nearest neighbors and repulsive between next-next-nearest neighbors) on a simple cubic lattice is studied. It is shown that the competing interactions lead to the order-disorder phase transitions. The geometric order parameter for localizing the second-order phase transition points is introduced. With its help the critical value of the interaction parameter was established, and the phase diagram of the system was constructed. An analytical quasi-chemical (QChA) approximation for evaluation of the equilibrium parameters of the system is proposed. The chemical potential, the thermodynamic factor, and the correlation functions are determined both within the framework of the developed approximate approach and as a result of the Monte Carlo simulation of the lattice system. The obtained dependence of the thermodynamic factor of the system on concentration indicates a strong suppression of fluctuations, characteristic for an ordered state. In turn, the complex nature of the concentration dependence of the correlation functions reflecting the structural features of the system demonstrates the important contribution of competing interactions. The proposed analytical approach allows one to correctly describe the qualitative features of the structural properties of systems with competing interactions and can be used to quantify the thermodynamic characteristics of these systems.

Author Biographies

Yaroslav G. Groda, Belarusian State Technological University, 13a Sviardlova Street, Minsk 220006, Belarus

PhD (physics and mathematics), docent; associate professor at the department of mechanics and engineering, faculty of chemical technology and engineering

Vyacheslav S. Vikhrenko, Belarusian State Technological University, 13a Sviardlova Street, Minsk 220006, Belarus

doctor of science (physics and mathematics), full professor; professor at the department of mechanics and engineering, faculty of chemical technology and engineering

Dung di Caprio, National Graduate School of Chemistry, 11 Pierre and Marie Curie Street, Paris 75005, France

PhD (physics); researcher

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Published
2019-05-20
Keywords: lattice fluid, simple cubic lattice, competing interaction, SALR-potential, order parameter, Monte Carlo simulation, critical parameter, phase diagram, quasi-chemical approximation
Supporting Agencies The project has received funding from European Union’s Horizon-2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 734276, Institute for Nuclear Problems of Belarusian State University (agreement No. 209/103) and the Ministry of Education of the Republic of Belarus.
How to Cite
Groda, Y. G., Vikhrenko, V. S., & di Caprio, D. (2019). Lattice fluid with attractive interaction between nearest neighbors and repulsive interaction between next-next-nearest neighbors on simple cubic lattice. Journal of the Belarusian State University. Physics, 2, 84-95. https://doi.org/10.33581/2520-2243-2019-2-84-95