Binary and ternary fluorides of some lanthanides (Ce, Eu(II,III), Yb) and Al were synthesized and annealed at high temperatures. Some of them were tested by the thermal evaporation in deep vacuum to produce thin-film coatings. Their structure and composition was studied doth by X-ray analysis and chemical analysis. Magnetic susceptibilities of the samples have been measured by the Faraday method. Table − Composition and magnetic properties of the fluoridestabel1) EBE – refuse after electron beam-evaporation; 2) RE – refuse after resistive thermal evaporation, h – hexagonal, rh. – orthorhombic, c – cubic and t – tetragonal structure; 3) calculated; 4) per Eu – ion Specimens of Eu-containing fluorides showed a significant deviation in the composition from the stoichiometry after the annealing at high temperature and deep vacuum. It is caused both by partial reduction and disproportioning due to the donor-acceptor interaction. The values of magnetic susceptibility both of individual fluorides (CeF3, EuF3, EuF2, YbF3) and the systems, based on them, correlates with the electronic structure of the corresponding lanthanides and with the composition of the specimens (table). Some of them (CeF3, YbF3, YbF3-CeF3, EuAlF5) satisfy the well-known Curie-Weiss equation:formulawhere k– Boltzmann constant, θp– paramagnetic Curie temperature, μeff– effective magnetic moment, χ0 – temperature - independent component of susceptibity (Van-Fleck constant). It made possible calculating effective magnetic moment of the lanthanide ions in the studied compounds. Their values appeared to be close to those from scientific literature. Although most of the Eu-based specimens did not satisfy above mentioned equation due to Eu2+ - Eu3+ electron exchange interaction.