The effects of high concentrations of polar aluminum trihydrate (ATH) molecules on the dielectric relaxations of low-density polyethylene (LDPE) have been studied by dielectric loss (tan ) measurements in the temperature range from 25 to 370 K. It was found that there are strong effects of polar ATH molecules on and relaxation peaks, but no effect on the relaxation peak, which is usually attributed to the localized conformational changes such as crankshaft or kink motion of the main chain in amorphous-phase surface layers of LDPE. Both strong and peaks are shifted to lower temperatures with increasing concentration of ATH in the polymer. This behavior of and dielectric relaxations of LDPE was related to the morphological changes in the amorphous and the crystal phase of highly doped semicrystalline polymer.
Far-infrared reflection spectra and results of dielectric measurements of SrTiO3 single
crystal doped by neodymium are presented in the paper. Dielectric investigations were conducted at
temperature range from 25 K to room temperature for the test frequency 1MHz. The numerical
analysis of the far-infrared reflection spectra made using a fitting procedure based on factorized
form of the dielectric function. The results for SrTiO3: Nd are compared with those for pure
crystal. The lowest-frequency phonon mode is found to be strongly influenced by presence of
neodymium ions in SrTiO3 single crystal.
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