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First principles calculations on nitrogen reactivity on tungsten surfaces.

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Nitrogen reduces hydrogen retention on tungsten surfaces. Dissociation of nitrogen-containing radicals on W{100} and W{110} surfaces yields incorporated nitrogen atoms and adsorbed protons.

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Area of Science:

  • Surface Science
  • Materials Science
  • Computational Chemistry

Background:

  • Tungsten surfaces are crucial in plasma-based material processing.
  • Understanding nitrogen and hydrogen interactions is key for controlling material properties.

Purpose of the Study:

  • Investigate nitrogen molecule and hydrogen nitride radical adsorption and dissociation on W{100} and W{110} surfaces.
  • Predict nitrogenized species on tungsten after plasma discharge.
  • Assess the impact of nitrogen on hydrogen retention and surface reactivity.

Main Methods:

  • Spin-polarized gradient-corrected density functional theory (DFT) calculations.
  • Modeling of clean, hydrogen-saturated, and nitrogen-saturated tungsten surfaces.
  • Analysis of radical dissociation with initial kinetic energies up to 2.5 eV.

Main Results:

  • NH, NH2, and NH3 radicals dissociate on tungsten surfaces.
  • Dissociation products include surface-incorporated nitrogen atoms and adsorbed protons.
  • Nitrogen incorporation significantly reduces hydrogen retention on tungsten surfaces.

Conclusions:

  • Nitrided tungsten surfaces exhibit reduced reactivity compared to clean surfaces.
  • The W{100} and W{110} surfaces show distinct behaviors in nitrogen and hydrogen interactions.
  • Nitrogen plays a critical role in modifying tungsten surface properties during plasma exposure.