Dresden 2014 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 56: Liquid and Amorphous Metals IV
MM 56.5: Talk
Thursday, April 3, 2014, 12:30–12:45, IFW A
Heat flow analysis of amorphous solids using dynamic differential scanning calorimetry (DDSC) — •Birte Riechers1, Ranko Richert2, Carsten Mahn1, and Konrad Samwer1 — 11.Physiklisches Institut, Georg-August-Universität Göttingen, Deutschland — 2Department of Chemistry and Biochemistry, Arizona State University, USA
Relaxation modes, especially their detailed description and understanding, play a captivating role for physicists working with glassy matter. One of many interesting aspects is the temperature dependence of the relaxation mode distribution, and of their relaxation times, which can be explored by DDSC. Therefore, the heat response of amorphous PdCuSi and PMMA is analyzed by applying a periodic triangular excitation of temperature below the glass transition temperature. Though only odd harmonics contribute to the excitation function, i.e. temperature, also even harmonics are seen in the response function, i.e. heat flow. This non-linear behavior gives information about the energy transfer to excited relaxation modes due to temperature variation. Moreover, the change in specific heat of even harmonics offers insight into temperature dependent relaxation times of excited modes.
Financial support by the DFG Research Unit FOR 1394 is thankfully acknowledged.