Magnetic Nanocomposites Based on Opal Matrices

Abstract

Features of obtaining magnetic nanocomposites based on the lattice packing of SiO2 nanoscale (opal matrices) with clusters of multiferroic materials (Li-Zn, Bi, Fe, Dy, Gd and Yb titanates) in their interstitial cavities have been considered. For magnetic nanocomposites creation opal matrices with SiO2 nanoscale of ~ 260 nm in diameter have been used. The composition of nanocomposites has been also studied using X-ray diffractometry and Raman spectroscopy. The results of the frequency dependences measurement for the dielectric constant of the nanostructures obtained have been presented. Hysteresis loops have been examined for the samples obtained in the temperature range from 2 to 400 K.

Dielectric and Magnetic Properties of Nanocomposites Based on Opal Matrixes, Phosphates and Vanadates of Metals

“…The periodic structure of nanoparticles in OM voids significantly changes the properties of the metamaterials, that by their properties are significantly different from similar monolithic substances. The developed nanocomposite materials with spatial dispersion of properties similar to film nanocomposites based on a polymer matrix [6], could be applied in sensors [8], optical devices and radio electronics equipment in the frequency range from the tens of GHz up to the units of THz [4,[9][10][11].…”

“…OM nanomaterials have good dielectric and magnetic resonance properties when filling voids in the matrix were made with metal vanadates of the general formula RVO4, where R is rare-earth metals (Dy, Gd, Pr, Yb and oth.). In this case, in OM, the filling of voids was carried out by synthesizing magnetic substances directly in the voids [2,10]. One of the main problems to obtain nanocomposites based on OM is the lack of data on the behavior of substances in nanostates at the temperatures of 975-1475 K, as well as on crystallization of SiO2.…”