J Phys Condens Matter. 2010 Nov 10;22(44):445504. doi: 10.1088/0953-8984/22/44/445504. Epub 2010 Oct 22.

Dissolution and diffusion properties of carbon in tungsten.

Journal of physics. Condensed matter : an Institute of Physics journal

Yue-Lin Liu, Hong-Bo Zhou, Shuo Jin, Ying Zhang, Guang-Hong Lu

PMID: 21403351 DOI: 10.1088/0953-8984/22/44/445504

Abstract

We have investigated the structure, solution and diffusion behavior of carbon (C) in tungsten (W) based on first-principles calculations. The single C atom is energetically favorable sitting at the octahedral interstitial site (OIS) with a solution energy of 0.78 eV in W. Double C atoms tend to be paired up at the two neighboring OISs along the (210) direction with a distance of ∼ 3.57 Å and a binding energy of + 0.50 eV. This suggests that a positive attractive interaction between C atoms exists, which might lead to a local higher concentration of C in W and form carbide. Kinetically, the C and vacancy diffusion co-efficients as a function of temperature have been determined, and are 1.32 × 10(-19) m(2) s(-1) and 3.11 × 10(-23) m(2) s(-1) at a typical temperature of 600 K, respectively.

Publication Types

• Journal Article
• Research Support, Non-U.S. Gov't