Low temperature synthesis and magnetism of La0.75Ca0.25MnO3 nanoparticles Original Research Article

We have reported here a new route to synthesize nanosized La0.75Ca0.25MnO3 perovskite crystalline complex oxides at a calcination temperature of 450–600°C using the amorphous molecular alloy of La–Ca–Mn–DTPA as precursors. The size and topography of the oxides are dependent on the calcinating temperature of the precursors. The resulting particle size is in a range of 20–100 nm as determined by transmission electron microscopy. The magnetization of La0.75Ca0.25MnO3 nanophase is strikingly dependent on the particle size. The magnetoresistance of the samples shows spin-polarized tunneling behavior at low temperatures.