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MM: Fachverband Metall- und Materialphysik
MM 12: Postersitzung I
MM 12.39: Poster
Montag, 14. März 2011, 17:30–19:00, P5
Characterization of ex-situ heated Fe70Pd30 thick films using TEM and STEM techniques — •Andriy Lotnyk1, Christoph Bechtold2, Burak Erkartal1, Lorenz Kienle1, and Eckhard Quandt2 — 1Synthesis and Real Structure, CAU Kiel, Kaiserstr. 2, 24143 Kiel — 2Inorganic Functional Materials, CAU Kiel, Kaiserstr. 2, 24143 Kiel
The phase transformations in the system Fe-Pd were mostly studied on bulk samples. However, the structural evolutions of Fe-Pd films at the composition of Fe70Pd30 are less examined. Here, Fe70Pd30 films with a thickness of 1-5 micrometer were produced by magnetron sputtering on thermally oxidized Si substrates and on a (001)-oriented MgO substrate. Before deposition, the Si substrates were covered by Au layers for obtaining freestanding films while for the MgO substrate, a Cr/Rh layer was used to enhance epitaxial growth of Fe70Pd30. Polycrystalline bcc Fe70Pd30 films were formed on Si while an epitaxial bct Fe70Pd30 film was grown on MgO. The obtained films were ex-situ heated at 650 °C and at 850 °C for 30 min. After heating of the freestanding bcc Fe70Pd30 film at 650 °C, a film containing the fcc Fe60Pd40 and Fe-rich grains was observed while the transformation from bcc to fcc Fe70Pd30 was found for the films heated at 850 °C. The latter films are decomposing into a Fe-Pd alloy with composition close to 70:30 and Fe-rich precipitates. Heating of the epitaxial bct Fe70Pd30 film at 850 °C also leads to the formation of the fcc structure, however, in this case Fe diffused into MgO and a dissolution of Rh into the Fe70Pd30 phase was observed.