Berlin 2024 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 61: Liquid and Amorphous Materials III
MM 61.5: Talk
Thursday, March 21, 2024, 16:30–16:45, C 243
Fe and Zr diffusion in columnar Cu-Zr nano-glasses — •Christian Aaron Rigoni1, Hendrik Voigt1, Evgeniy Boltynjuk2, Anoosheh Akbari1, Bonnie Tyler3, Sergiy Divinski1, Harald Rösner1, Horst Hahn2,4, and Gerhard Wilde1 — 1University of Münster, Institute of Materials Physics, Münster, Germany — 2Institute of Nanotechnology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany — 3University of Münster, Physikalisches Institut and Center for Soft Nanoscience, Münster, Germany — 4University of Oklahoma, CBME and AME, Norman, OK73019, US
The concept of nano-glasses is to combine the beneficial characteristics known from defects in a crystalline material with an amorphous structure of a glassy alloy, with a focus on the presence of glass-glass interfaces. The presented study investigates anomalous diffusion along such interfaces in magnetron-sputtered Cu60Zr40 columnar nanoglasses. A combination of the radiotracer technique and time-of-flight secondary ion mass spectroscopy is used to measure the solute diffusion of Fe and self-diffusion of Zr atoms. The obtained results are directly compared to a homogenous glass with a similar composition, revealing enhanced diffusivities which are interpreted in terms of an excess free volume located at the glass-glass interfaces. The diffusion studies are directly supported by the structural observations made by TEM, documenting the existence of two different amorphous phases and correspondingly glass-glass interfaces in the columnar Cu-Zr nanoglass.
Keywords: nanoglass; diffusion; ion beam sputtering; time-of-flight secondary ion mass spectroscopy; excess free volume