MECHANISM OF THE RELATIONSHIP BETWEEN COMPOSITION AND STRUCTURE IN ORTHORHOMBIC MULTIFERROICS Eu1-xSrxMnO3 (x = 0; 0.15; 0.25)

The paper presents results of the study of the structure evolution in perovskite-like manganites Eu1–xSrxMnO3 (x = 0; 0.15; 0.25). The influence of chemical composition and temperature on the phase state of manganites is shown. It is established that the substitution of europium with strontium in the range 0  x  0.25 does not lead to the Jahn — Teller order-disorder transition (O'O). An increase in temperature in the range of 300–980 °C provokes an O'O transition, and with an increase in the concentration of strontium, the transition temperature decreases.