Article ID Journal Published Year Pages File Type
1482135 Journal of Non-Crystalline Solids 2011 4 Pages PDF
Abstract
Thermal conductivity κ(T) data for homologous series of primary mono-hydric alcohols - methanol, ethanol, 1-propanol, 1-butanol - within their molecular glass states are analyzed within the temperature region stretching from 2 K up to the glass transition Tg. Below 7 K κ(T) increases with the number of carbon atoms in the molecule. Furthermore, its temperature dependence exhibits a behavior akin to that predicted by the phenomenological model of soft potentials (SPM). The data are then rationalized in terms of the SPM parameters such as characteristic energy W and the parameter ¯С which measures the strength of the coupling of acoustic modes with two-level systems. The dependence of such parameters upon the molecular mass of the alcohol seems to agree with the SPM predictions. The parameters ¯С and W were used to calculate the boson peak energies. The values obtained agree well with literature data.
Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
Authors
, , , , , , , ,