Document Type

Report

Publication Date

2004

Abstract

The goal of this project, which started in May 2004, is to elucidate the chemical bonding and interface formation of metal fission products with the coating materials used in state-of-the-art TRISO fuel particles. Particular emphasis is placed on an analysis of intermediate chemical phases at the interface, the intermixing/diffusion behavior, and the electronic interface structure as a function of material choice (metal and coating materials), temperature, and external stress.


In detail, this project is devoted to studying the interface formation of Pd, Ag, and Cs with SiC and pyrolytic carbon. Using the TRISO coating materials and single crystal references as substrates, interfaces are prepared under controlled conditions in an ultra high vacuum environment and studied with a variety of different spectroscopic methods. The combination of surface sensitive techniques (e.g., photoelectron spectroscopy) with bulk sensitive methods (e.g., X-ray emission spectroscopy) probes the chemical properties as well as the diffusion behavior in several complementary ways. A variety of surface modification methods is and will be applied ex-situ (e.g., for stressed coating layers) or in-situ (e.g., by ion bombardment or plasma surface treatment) prior to or after the interface formation to study the dependence of the interface properties on the
surface/interface morphology and quality of the coating material.

Chemical structure; Electronic structure; Metal-base fuel; Metal coating; Nuclear chemistry; Nuclear fuels; Palladium; Silicon carbide

Keywords

Chemical structure; Electronic structure; Metal-base fuel; Metal coating; Nuclear chemistry; Nuclear fuels; Palladium; Silicon carbide

Disciplines

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

Language

English


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