Sub-lattice Melting in Amorphous Tantala

ORAL

Abstract

We use molecular dynamics to investigate amorphous tantala and doped tantala. We found an interesting sub-lattice melting phase during annealing process. Our simulation shows that in this particular phase only oxygen is diffusive while tantalum is not. The calculated self-diffusion coefficient of oxygen is about 100 times larger than that of tantalum, or is in the order of 10-5 cm2/s at around 2000K. Simulations are also performed for Zr- and Ti-doped tantalum oxides, and the dopant effects are analyzed.

*This work was supported by the LIGO coating center funded by the U.S. National Science Foundation under Award No. NSF/PHY:1707870.

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Presenters

  • Rui Zhang

    • University of Florida

Authors

  • Rui Zhang

    • University of Florida

  • Jun Jiang

    • University of Florida

  • Alec S Mishkin

    • University of Florida

  • Hai-Ping Cheng

    • University of Florida
    • UFL