X-ray-absorption studies of krypton precipitates in solid matrices

Journal Article · Tue Jan 15 04:00:00 EST 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.1987· OSTI ID:6359794

Tan, Z; Budnick, J I; Pease, D M; Namavar, F ^[1]

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1. Department of Physics and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269-3046 (US)

Krypton {ital K}-edge x-ray-absorption spectra have been measured at 300 and 80 K on samples of krypton-implanted Al and Nb foils, graphite, and Grafoil. The near-edge spectra (XANES) at both 300 and 80 K exhibit a white line. Comparisons with the XANES data of bulk solid krypton and spectra amongst different host materials suggest that the krypton in all the implanted hosts precipitates into bubbles at high dosages. The bubbles in Nb hosts are probably all in the solid phase even at 300 K. For Al, graphite, and Grafoil, the bubbles appear to exist in both solid and nonsolid form. The Kr-Kr nearest-neighbor distance in the solid Kr precipitates is estimated from XANES data using an empirical relation deduced from data on bulk solid krypton under high pressure. High pressure within the Kr precipitates is revealed from the smallness of the lattice parameter and the lattice expansion at low temperature. Extended x-ray-absorption fine structure is observed only on a postimplantation thermally annealed Al sample and an as-implanted Nb sample.

• DOE Contract Number: AS05-80ER10742; AC02-76CH00016
• OSTI ID: 6359794
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:3; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ABSORPTION SPECTRA
ALUMINIUM
CARBON
ELEMENTAL MINERALS
ELEMENTS
FLUIDS
GASES
GRAPHITE
ION IMPLANTATION
KRYPTON
LOW TEMPERATURE
MATRIX ISOLATION
MEDIUM TEMPERATURE
METALS
MINERALS
NIOBIUM
NONMETALS
PRECIPITATION
RARE GASES
SEPARATION PROCESSES
SPECTRA
TRANSITION ELEMENTS
X-RAY SPECTRA