The structural examinations of Gd₂Fe₁₇, GdFe₂ were carried out. The films were prepared by means of thermal evaporation at different temperatures of NaCl-substrates. Annealing of films was occured in column of microscope, with velocity 10-30 К/с. The temperature of substrate carriers changed within range 300-400K, and limits of thermal effect on films considered of 300-800K. Structural studies were carried out with using of the electron microscope.
                Investigation were carried out in two directions: influence of condition of precipitation (temperature substrate) and influence of annealing (kinetics of crystallization) on formation of structure of films.
                Electron diffraction investigations of Gd₂Fe₁₇ films, precipitated at Тs=300 K have shown that temperature stable amorphous condensates formed under these conditions. It was determined, that thermal annealing of such films lead to the formation of a polycrystal film with phases a-Fe and Gd₆Fe₂₃. Initial crystallization phases are crystallites a-Fe.
                Absolutely different pattern of kinetics of crystallization is observed at film precipitation on heated substrates. With the temperatures range from room and up to Тs=400 К the amorphous films are formated. At Тs=500 K films become amorphous-crystalline. At further increase of temperature the share of a polycrystal phase increases. Decoding of electron diffraction patterns has shown, that the polycrystal part of films consists of three phases: Gd₂Fe₁₇ (60 %) with structural type Th₂Ni₁₇ (fi1-phase), Gd₂Fe₁₇ (30 %) with structural type Th₂Zn₁₇ (fi2-phase) and some (about 10 %) GdFe₅ with structural type CaCu₅.
            The presence of crystallites of several phases in explored films results in the mutual blocking of growth of crystallites during crystallization of films. This predetermined a finedispersivity of films and stability of an amorphous phase.