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Berlin 2012 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 17: Poster Session

MM 17.80: Poster

Monday, March 26, 2012, 17:00–19:00, Poster B

Study of the EFGs at both M- and A-sites in Zr2InC and Hf2InC using γ-γ angular correlation spectroscopy — •Daniel Jürgens1, Michael Uhrmacher1, Ulrich Vetter1, Hans Hofsäss1, Jose Mestnik-Filho2, and Michel W. Barsoum31Georg-August-Universität Göttingen, II. Physikalisches Institut, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany — 2Instituto de Pesquisas Energeticas e Nucleares, 05422-970 São Paulo, Brazil — 3Dep. Mat. Science and Eng. Drexel University, Philadelphia, PA 19104, USA

The compounds Zr2InC and Hf2InC belong to the class of MAX phases, which are known for their metallic and ceramic characteristics. Due to their unusual set of properties, these phases have been studied intensively in recent years with the aim to find new high-performance materials. Since most applied techniques only allow a macroscopic insight, the perturbed angular correlation (PAC) was used to determine the local environment of inserted probes on atomic scale. Radioactive 111In and 181Hf ions were implanted into the samples to measure characteristic electric field gradients, EFGs, at a certain site. The A-site EFG was investigated by using the 111In isotope and the M-site by 181Hf probes. In this study we report on the different annealing behaviors of In- and Hf-probes in Zr2InC and Hf2InC. We show that the A-site EFG strengths are nearly identical (νQ≈ 350 MHz), while the EFGs for the M-site are unequal. We compare the experimental results with predictions from density functional theory calculations and give reasons why the A- and M-site EFGs are in such a way dissimilar.

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