Sep 12 – 17, 2010
CERN
Europe/Zurich timezone
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Perturbed gamma-gamma angular correlation studies of indium containing 211-MAX phases

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500/1-001 - Main Auditorium (CERN)

500/1-001 - Main Auditorium

CERN

CH - 1211 Geneva 23 Switzerland
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POSTER Semiconductors, Metals and Insulators

Speaker

Mr Daniel Juergens (II. Physikalisches Institut, Universitaet Goettingen)

Description

The M(n+1)AXn (MAX) phases, where n is 1, 2 or 3, are nanolaminated layered hexagonal carbides and nitrides, which feature an unusual set of attributes of both metals and high-performance ceramics. Theses intermetallic compounds can be good electrical and thermal conductors, behave elastically stiff as well as high thermal shock resistant and damage tolerant. To investigate the local structure of these phases, the technique of perturbed angular correlation (PAC) was used for material characterization beside X-ray diffraction and electron microscopy. Radioactive 111In ions were implanted at 400 keV into the samples, sensing as spies their local environment via hyperfine interactions. The PAC technique was applied to the 211-MAX phases Ti2InC, Zr2InC and Nb2InC to determine strength and symmetry of the electric field gradients (EFG) as a fingerprint for probe atoms on the A-site. In each material an axially symmetric EFG was found with a characteristic quadrupole coupling constant varying between 200 MHz and 350 MHz. Regarding to the question of lattice location we demonstrate that the In-probes occupy the A-site since In is the self-atom on the unique A-site in these phases and by comparing the experimental results with ab initio DFT calculations using the FP-LAPW+LO method implemented in the WIEN2k package.
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Primary author

Mr Daniel Juergens (II. Physikalisches Institut, Universitaet Goettingen)

Co-authors

Prof. Hans Hofsaess (II. Physikalisches Institut, Universitaet Goettingen) Prof. Jose Mestnik-Filho (Instituto de Pesquisas Energeticas e Nucleares) Dr Michael Uhrmacher (II. Physikalisches Institut, Universitaet Goettingen) Prof. Michel W. Barsoum (Department of Material Science and Engineering, Drexel University) Dr Ulrich Vetter (II. Physikalisches Institut, Universitaet Goettingen)

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