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Title: An x-ray absorption spectroscopy study of Mo oxidation in Pb at elevated temperatures

The corrosion of fuel cladding and structural materials by lead and lead-bismuth eutectic in the liquid state at elevated temperatures is an issue that must be considered when designing advanced nuclear systems and high-power spallation neutron targets. In this work, lead corrosion studies of molybdenum were performed to investigate the interaction layer as a function of temperature by X-ray absorption spectroscopy. In situ X-ray absorption measurements on a Mo substrate with a 3-6 {micro}m layer of Pb deposited by thermal evaporation were performed at temperatures up to 900 C and at a 15{sup o} angle to the incident X-rays. The changes in the local atomic structure of the corrosion layer are visible in the difference extended X-ray absorption fine structure and the linear combination fitting of the X-ray absorption near-edge structure to as-deposited molybdenum sample and molybdenum oxide (MoO{sub 2} and MoO{sub 3}) standards. The data are consistent with the appearance of MoO{sub 3} in an intermediate temperature range (650-800 C) and the more stable MoO{sub 2} phase dominating at high and low temperatures.
Authors:
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Publication Date:
OSTI Identifier:
1005708
Resource Type:
Journal Article
Resource Relation:
Journal Name: J. Nucl. Mater.; Journal Volume: 392; Journal Issue: (2) ; 07, 2009; Conference: Anaheim, CA
Research Org:
Argonne National Laboratory (ANL)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
ENGLISH
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; ABSORPTION; ABSORPTION SPECTROSCOPY; ACCIDENTS; BISMUTH; CLADDING; CORROSION; EUTECTICS; EVAPORATION; FINE STRUCTURE; FUELS; FUNCTIONS; INTERACTIONS; LAYERS; LEAD; LIQUIDS; MOLYBDENUM; MOLYBDENUM OXIDES; NEUTRONS; NUCLEAR FUELS; OXIDATION; REACTORS; SPALLATION; SUBSTRATES; TEMPERATURE RANGE; TEMPERATURE RANGE 0065-0273 K