Characterization of Structural Transition and Heterogeneity under Compression for Liquid Al2O3 Using Molecular Dynamics Simulation

Molecular Dynamics Liquid Network Structure Phase Cluster Structural Transition.

Authors

  • Pham Huu Kien Department of Physics, Thainguyen University of Education, No. 20 Luong Ngoc Quyen, Thainguyen,, Viet Nam
  • Tran Thi Quynh Nhu 1) Department of Physics, Thainguyen University of Education, No. 20 Luong Ngoc Quyen, Thainguyen, Viet Nam. 2) Tuyen Quang High School for Gifted Students, Tran Hung Dao Street, Tuyenquang,, Viet Nam
  • Giap Thi Thuy Trang
    tranggtt@tnue.edu.vn
    Department of Physics, Thainguyen University of Education, No. 20 Luong Ngoc Quyen, Thainguyen,, Viet Nam
Vol. 3 No. 2 (2022): June
Research Articles

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We have performed a simulation of the structural transition and Structural Heterogeneity (SH) in liquid Al2O3 at 3500 K, in the range of 0–100 GPa. The results confirmed that the network structure of liquid alumina is built mainly from AlOx (x = 3, 4, 5, 6, 7) units, which are related to each other through the common oxygen atoms. The existence of separate AlO3-, AlO4-, AlO5-, AlO6- and AlO7- phases, where SH of the network structure can be sufficiently determined, besides, the existence of separate phases is clarified for SH in the liquid of Al2O3. In particular, at a pressure below 10 and beyond 20 GPa, AlOx units are uniformly distributed in the space and non-uniformly distributed in the range 10-20 GPa. Our study is expected to contribute to a simple way to determine the structural heterogeneity and diffusion coefficients of oxide systems.

 

Doi: 10.28991/HIJ-2022-03-02-08

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