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Using the x-ray diffraction method, the atomic rearrangement in amorphous La0.6Sr0.2Mn1.2O3 films is investigated at growth temperatures Ts = 20–300 °C. Two stages in the disorder–order phase transition are discovered. In the first stage, amorphous structure undergoes ordering at Ts = 100 °C up to a maximal concentration of small (D≈30 Å) clusters which occupy 90% of the total volume. In the Ts = 100–150 °C temperature interval, disordering in the structure and a change in short-range order prepare the onset of a second stage. In the second stage, starting with Ts = 150 °C, the progressive crystallization and transition from mesoscale order to long-range atomic order at Ts = 300 °C take place. It is shown that all transitions produce changes in the conductivity mechanisms and magnetic properties of the films.

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