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Photoabsorption coefficient of alloys of Al with transition metals V, Fe, Ni and Cu and Pr from 30 to 150 eV photon energy

  • The absorption coefficient of VAI3, FeAI, NiAI, NiAl2, CuAI2, PrAl2, and of disordered V–AI (16 at% AI, 28%, 41%) and Fe–AI (11%) alloys has been measured in the region of the M₂,₃ absorption of the transition metals and the Labsorption of AI. The strong changes of the AI spectrum in the region of the 100 eV maximum upon alloying are explained as another evidence of the EXAFS (extended X-ray absorption fine structure) nature of these structures. The broad, prominent absorption peaks from the 3p excitations in V and Fe and from the 4d excitations in Pr are influenced only little on allyoing and thus appear to be of atomic origin. The fine structure at the onset of the Pr 4d transitions is identical in the metal and the alloy but differs from that of Pr oxide. The only M₂,₃ edge which is detectably shifted is that of Ni (up to 2.1 eV), whereas the onset of the AI L₂,₃ edge is shifted in all the alloys (up to 1.1 eV). The shifts are interpreted in accordance with X-ray fluorescence and nuclear resonance measurements as changes of the density of states in the valence band of the alloys.

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Metadaten
Author:Hans-Jürgen Hagemann, W. Gudat, C. Kunz
DOI:https://doi.org/10.1002/pssb.2220740211
ISBN:0031-8957
Parent Title (English):Physica status solidi b
Publisher:Wiley-VCH
Place of publication:Berlin
Document Type:Article
Language:English
Year of Completion:1976
Date of the Publication (Server):2012/12/18
Volume:74
Issue:2
First Page:507
Last Page:521
Note:
weitere ISSN 0370-1972
Link:https://doi.org/10.1002/pssb.2220740211
Zugriffsart:campus
Institutes:FH Aachen / Fachbereich Elektrotechnik und Informationstechnik
collections:Verlag / Wiley-VCH