Glass - Back to the Future!

Presenting Author:
Sindy Fuhrmann

article posted 21 March

Sindy Fuhrmann (*Reibstein) studied Mineralogy at TU Berakademie Freiberg and finished 2009 with a specialization in Technical Mineralogy with her diploma study on high-pressure studies of diffusion processes in the system Si-Al-O-N. In 2010 Sindy joint the group of Prof. L. Wondraczek at the Glass and Ceramic Institute of Friedrich-Alexander University Erlangen. Under his guidance, she finished her Phd-Thesis on the pressure dependence of topological heterogeneity in glasses in 2013. Since then she is working with Prof. L. Wondraczek at the Otto-Schott-Institute of Materials Research at Friedrich-Schiller University Jena. In her work, Sindy is focusing on the experimental description of the pressure dependence of glass structure and structure-property relations in glasses combining scattering and spectroscopic techniques.

In-situ SAXS during indentation on borosilicate glasses

Sindy Fuhrmann1,*, René Limbach1, C. Krywka2, L. Wondraczek1
1Otto-Schott-Institut of Materials Research, Friedrich-Schiller University Jena, Germany 2Institute of Materials Research, Helmholtz-Center Geesthacht Outstation at DESY, Hamburg, Germany

In-situ SAXS indentation experiments on borosilicate glasses were conducted at P03 MiNaXS Endstation at the German Electron Synchrotron DESY in Hamburg. Using a nanofocus X-Ray beam at 13 keV with a size of about 800 nm, spatial resolved scattering data was collected under the tip of an indenter in transmission geometry (see fig. 1).

Fig. 1 Representation of the experimental set-up of the in-situ X-ray scattering experiment. a) View along the sample, perpendicular to the incident X-rays. b) View perpendicular to the sample, along the incident X-rays.

The X-ray scattering amplitude at low angles directly correlates with the nano-sized chemical and topological fluctuations, which are inherent to glass structures (i.e. heterogeneity). The nanofocused X-Ray beam map the variance of the amplitude of electron density fluctuations (AEDF) as a function of the position relative to the indenter tip during the indentation experiment. Therefore, the dependence of the glass heterogeneity on the evolution of the indenter stress field can be deduced. The results of the indentation scenario will be compared to previous SAXS measurements on isostatic pre-compressed glasses.