Probing the different spatial scales of Kel F-800 polymeric glass under pressure

Elissaios Stavrou*, Muhtar Ahart, Mohammad F. Mahmood, Alexander F. Goncharov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


One of the fundamental open questions in condensed matter science is the origin of the unique universal characteristics of glasses. Among them, the Boson peak (BP) and the first sharp diffraction peak (FSDP) are directly related with the disordered nature of these solids. The lack of widely accepted understanding of the origin of these features makes the characterization of glass forming systems on the microscopic level challenging. Moreover a strong and open debate exists on the possible correlation between BP and FSDP and its origin. Here we present the first detailed concomitant Raman and x-ray diffraction study of these two features under hydrostatic pressure. Surprisingly, we find that the previously proposed correlations between the positions of BP and FSDP do not hold under pressure. Based on the anticorrelation of the characteristic dimensions, we conclude that, BP and FSDP probe different spatial scales corresponding to dynamical and structural dimensions, respectively.

Original languageEnglish
Article number1290
JournalScientific Reports
StatePublished - 2013
Externally publishedYes


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