Abstract
Monte Carlo simulations of `order-order' relaxations in AB 3 systems with L1 2 superstructure were carried out assuming vacancy mechanism of atomic jumps with constant atomic pair-interaction energy parameters and the saddle-point energies assigned to jumping atoms. The study was focused on relaxations following an increase of temperature. The simulated long-range order (LRO) relaxation curves fitted weighted sums of two exponentials strongly differing in relaxation times, the longer ones of which obeyed the Arrhenius law. The contribution (weight) of the fast process was gradually reduced when the activation barrier energy for B-atom jumps was increased in relation to that for A-atoms. It was found out that the initial stages of LRO relaxations were dominated by A-atom jumps between different sublattices. In conclusion, it is proposed that the fast component of the disordering relaxations in L1 2 superstructure is due to highly correlated pairs of A-atom and B-atom jumps, which occur provided the majority B-atoms are sufficiently mobile.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
