In this paper an experimental study regarding the structure and electrical properties of low density polyethylene composites filled with neodymium particles is presented. The analysis of the samples structure shows that the neodymium particles appear as clusters and the distance between them decreases if the filler content increases. The DC measurements show that the electrical conductivity values increase with the temperature and filler content. Using the absorption currents, dielectric response functions of composites f(t) are determined and the complex permittivity values are calculated and compared with experimental values. Good correlation between calculated values and experimental ones was found for frequencies lower than 100 Hz. Variations of the complex permittivity components with the neodymium content, temperature and frequency are also presented.