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A combined study of phase transitions in the La 0.9 Sr 0.1 MnO 3 compound was carried out using X-ray, electrical, and magnetic techniques. Two structural phase transitions were revealed at temperatures of ranges 100-115 K and 300-340 K. At temperatures 100-115 K, the transition proceeds with changing in the magnetic state of the compound, namely, in saturation magnetization and contribution of the paraprocess to the sample magnetization.