We have developed a simple low-cost novel synthesis route to synthesize nanosized La0.7Sr0.3MnO3 (LSMO) without any requirement of a calcinations step at high temperature. The study of these nanoparticles indicates excellent properties (magnetization and resistance at 0 T) similar to colossal magnetoresistance (CMR) materials sintered at 1600 °C for 20 h. The size and topography of the oxides are dependent on the calcinating temperature of the precursors. The resulting particle size is in the range of 20-100 nm as determined by transmission electron microscopy. The magnetization of LSMO nanophase is strikingly dependent on the particle size. The transition temperature from the paramagnetic to ferromagnetic state of the sample is quite sharp and occurs at 372 K for 600 °C calcined sample sintered at 1200 °C for 4 h. Magnetoresistance of magnitude -5.7% at the field up to 1 T was also observed at room temperature.
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