Molecular dynamics of ion exchangers SG-1M and SGK-7 determined from neutron spectroscopy data

Abstract

The inelastic neutron scattering spectra of samples of ion exchangers SG-1M and SGK-7, both “dry” and hydrated in heavy water, have been recorded in the temperature range 220–363 K on the time-of-flight spectrometers of the Kurchatov Institute and the Frank Laboratory of Neutron Physics of the Joint Institute for Nuclear Research. With an increase in the degree of hydration and sample temperature, the inelastic scattering spectra exhibit changes in the region of low-frequency vibrations, whereas the region of torsional vibrations of methyl groups remains relatively stable. Generalized frequency distributions are obtained for the samples studied. The effect of hydration and temperature on the noted microdynamic characteristics is discussed.