Ugorchuk V. V. UkraineIvano-Frankovsk Carpathian National University of V. Stefanik, 57, Shevchenko St., Ivano-Frankovsk, 76025 Author's articles Intercalation processes in laser-exposed rutile modified with α-Fe and Fe3O4 Electrophysical properties of non-stoichiometric lithium-iron magnesium-substituted spinels Dielectric qualities of lithium iron spineless doped by ion Mg+ on basis of impedance temperature researches