Migration and Stability of HgCdTe Lattice Defects.
Abstract
Continuing from our previous work on equilibrium phase diagrams of Hg-Cd-Te systems, diffusion of Hg and Cd in HgCdTe has been studied in this project. The path probability method (PPM) of irreversible statistical mechanics is used with a point as the basic cluster. Basic formulation of diffusion: A gradient of atomic density is applied to the system and the responding atomic flux is formulated. It is noteworthy to see that chemical potential gradient appears quite naturally as the driving force, as the Onsager theory requires, rather than the atomic density gradient. Hg fast diffusion: It is made of two branches. In the vacancy mechanism branch, diffusion decreases with Hg vapor pressure, P(Hg), while it increases in the interstitial mechanism branch. Equations are derived to show these branches and curves for the diffusion coefficient are plotted. Experimentally observed activation energy is given atomic interpretation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 29, 1988
- Accession Number
- ADA193293
Entities
People
- Ryoichi Kikuchi
Organizations
- University of Washington