ИСТИНА

Zinc-tellurite glasses 20ZnO−(80−x)TeO2−xFe3O4 (x = 0, 1, 3, 7) activated with Fe3O4 nanoparticles and BaTiO3 have been prepared with melt-quenching method. Some glass properties were studied with X-ray Diffraction, Raman and Optical spectroscopies, SQUID magnetometry and polarization measurements. X-Ray Diffraction confirmed the amorphous structure of glasses and crystallization of γ-Fe2O3 nanoparticles after heat-treatment. During the heat treatment a phase transformation of ferrimagnetic magnetite Fe3O4 into paramagnetic maghemite γ-Fe2O3 occurred. The average crystallite sizes of γ-Fe2O3 nanoparticles were evaluated with Scherer and Williamson−Hall methods. Raman Spectroscopy confirmed modification of glass network upon activation with magnetite nanoparticles and barium titanate. Optical absorbance revealed a decrease of band gap of zinc-telluride glasses from 3.19 down to 2.16 eV. The activation of glasses resulted in appearance of magnetic and electrical responses upon applied external magnetic and electrical fields.