Document Type

Annual Report

Publication Date



This project focuses on the chemical bonding and interface formation of metal fission products with the coating materials used in tri-isotropic (TRISO) fuel particles for gas-cooled reactors. By combining surface- and bulk-sensitive spectroscopic and microscopic methods, intermediate chemical phases at the interface, intermixing/diffusion behavior, and the electronic interface structure for different coating materials and metals are examined.

In detail, the project studies the interface formation of Pd, Cs, and Ag with SiC and pyrolytic carbon. Using SiC single crystals and highly-ordered pyrolytic carbon (HOPG) as substrates, interfaces are prepared under controlled conditions in an ultra-high vacuum environment and are studied with a combination of experimental methods, including Photoelectron Spectroscopy, Auger Electron Spectroscopy, X-Ray Emission Spectroscopy, and X-Ray Absorption Spectroscopy.

In the past year, emphasis was placed on a detailed analysis and description of the Cs/SiC and Cs/HOPG interface formation processes.


Cesium; Chemical structure; Electronic structure; Metal-base fuel; Metal coating; Nuclear fuels; Silicon carbide; X-ray spectroscopy


Chemistry | Materials Science and Engineering | Metallurgy | Nuclear Engineering | Oil, Gas, and Energy | Physical Chemistry