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Article

Строение, диэлектрические и магнитные свойства нанокомпозитов на основе опаловых матриц, фосфатов и ванадатов металлов

Белянин А., Багдасарян А., Гуляев Ю., Юрин А. И., Павлюкова Е.

Opal matrixes represent the regular 3D-pack of spherical particles of amorphous SiO2, forming an ordered system of voids. Opal matrixes with spherical particles of SiO2 diameter d ≈ 260 nm (Δd ≈ 2%) were synthesized. Nanocomposites were formed by filling voids (occupying ~26% of the volume) of opal matrixes by salt solutions, low-temperature heat treatment at 625–825 K and annealing at 975–1475 K. The formation in the voids of opal matrixes, depending on synthesis conditions, of the synthesized substances, SiO2 and products of interaction synthesized substances with SiO2 are submitted. The frequency dependences of the conductivity, real and imaginary components of the dielectric and magnetic permeability of nanocomposites containing crystallites 16–65 nm in size of magnetic materials — double phosphates (LiNiPO4, LiCoPO4) and vanadates (GdVO4 and DyVO4) were measured. The dielectric losses of nanocomposites remain low (at a level of ~0.06) in the frequency range 107–1010 Hz for nanocomposites with DyVO4 and LiCoPO4. The dielectric loss increases both in the direction of low frequencies (<106 Hz) and in the direction of THz frequencies. Investigations have demonstrated that the measured parameters are influenced by the phase composition, as well as the structural and magnetic state of the synthesized substances.