Now showing items 21-29 of 29

    • Ta Melting Point Calculation by Small-cell Coexistence Method 

      Hong, Qijun; van de Walle, Axel (2014-08-16)
      We calculate the melting temperature of Tantalum, by employing the small-size coexistence solid-liquid coexistence method. Two pseudo-potentials are employed, namely Ta_v (5d^3 6s^2) and Ta_pv (5p^6 5d^3 6s^2). Results ...
    • Elemental vacancy diffusion for fcc and hcp structures - spreadsheets for plots 

      Angsten, Thomas; Mayeshiba, Tam; Wu, Henry; Morgan, Dane (2014-09-18)
      See entry at http://hdl.handle.net/11256/76 for Angsten T et al (2014) Elemental vacancy diffusion database from high-throughput first-principles calculations for fcc and hcp structures. New J. Phys. 16 015018 http: ...
    • TiO_X 

      Burton, Bejnamin P.; van de Walle, Axel (2014-09-29)
      First principles based phase diagram calculations were performed for the hexagonal closest packed octahedral-interstitial solid solution system aTiOX, or aTi½ 1 XOX ([ ]¼Vacancy; 0rXr1=2), by the cluster expansion (CE) ...
    • CaCO3-MgCO3 and CdCO3-MgCO3 

      Burton, Bejnamin P. (2014-11-20)
      Planewave pseudopotential calculations of supercell total energies were used as bases for firstprinciples calculations of the CaCO3–MgCO3 and CdCO3–MgCO3 phase diagrams. Calculated phase diagrams are in qualitative to ...
    • First principles phase diagram calculations for the wurtzite-structure systems AlN-GaN, GaN-InN, and AlN-InN 

      Burton, Bejnamin P.; van de Walle, Axel; kattner, Ursula (2014-11-20)
      First principles phase diagram calculations were performed for the wurtzite-structure quasibinary systems AlN–GaN, GaN–InN, and AlN–InN. Cluster expansion Hamiltonians that excluded, and included, excess vibrational ...
    • Antiphase boundary energy of Ni3Al with Ti impurities from Monte Carlo simulations 

      Sun, Ruoshi; van de Walle, Axel (2016-04-07)
      {111}<110> antiphase boundary (APB) energy of Ni3Al with varying Ti impurity concentration (x=0.1, 1, 10%) and temperature (T=400, 600, 800, 1000, 1200, 1400, 1600 K) are obtained from cluster expansion and Monte Carlo ...
    • NaCl-KCl 

      Burton, Bejnamin P.; van de Walle, Axel
      First principles phase diagram calculations were performed for the system NaCl-KCl. Planewave pseudopotential calculations of formation energies were used as a basis for fitting cluster expansion Hamiltonians, both with- ...
    • Ti-X (X=Al, V, Nb, Ta, Mo, Zr, and Sn) impurity diffusion coefficients from first-principles calculations 

      Xu, Weiwei; Shang, ShunLi; Zhou, Bi-Cheng; Wang, Yi; Liu, Xingjun; Wang, Cuiping; Liu, Zi-Kui
      Knowledge of diffusivity is fundamental to our understanding of diffusion mechanism and design of materials. Despite various elements dissolved in industrial Ti alloys to improve their performance, diffusion coefficients ...
    • MoS2-MoTe2 

      Burton, Benjamin P; Singh, Arunima
      A first principles phase diagram calculation, that included van der Waals interactions, was performed for the system (1-X)$\cdot$MoS$_{2}$-(X)$\cdot$MoTe$_{2}$. Surprisingly, the predicted phase diagram has at least ...