Dielectric and magnetic properties of nanocomposites based on opal matrixes, phosphates and vanadates of metals

Materials Science Forum. 2019. Vol. 970. P. 100–106.

Belyanin A. F., Bagdasaryan S. A., Bagdasaryan A. S., Yurin A., Surzhikov A. P.

Opal matrix is a regular 3D-packing 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. The frequency dependences of the conductivity, real and imaginary
components of the dielectric and magnetic conductivity 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.

Keywords: Nanocomposites, нанокомпозиты, dielectric and magnetic properties, опаловые матрицы, opal matrices, double phosphates of Li and Ni(Co), диэлектрические и магнитные свойства