Low temperature synthesis of nanosized La1-xCaxMnO3 using amorphous molecular alloys as precursors

Perovskite manganates of the type La1-xCaxMnO3 is of considerable interest in solid state physics and chemistry because of its special magneto - trans port properties, colossal magnetoresistance (CMR) effect. We reported here a new route to the nanosized La1-xCaxMnO3 perovskite crystalline complex ox ides at relatively low calcination temperature (450 degrees C similar to 60 0 degrees C) using amorphous molecular alloys of La - Ca - Mn - DTPA as pre cursors. The size and topography of the oxides are dependent on the anneali ng temperature of the precursors. The particle size is, ranging from 25nm t o 100nm determined by TEM under calcinating temperature of 450 degrees C to 600 degrees C. The AC susceptibility is found to be strongly dependent on the particle size. preliminary magnetoresistance research on pellet sample shows spin - polarized tunneling behavior at low temperature range.