Abstract
Nanocrystalline La 1− x Sr x MnO 3 has been prepared by a new solution chemistry technique, and the processing parameters were optimized. The thermal history of the as-prepared gel is investigated by differential thermal (DTA) and thermogravimetric analysis (TGA). Formation of La 1− x Sr x MnO 3 starts at temperatures as low as 575 °C. Powder X-ray diffraction analysis was used to check the crystallographic phase purity of nanocrystalline La 1− x Sr x MnO 3. Transmission electron microscopic investigation (TEM) reveals that the grain size of samples prepared at 575 °C were in the range of 20–30 nm. The Mn–K edge EXAFS measurements show the nanocrystalline LaMnO 3 and La 1− x Sr x MnO 3 indicate a distortion in the MnO 6 octahedra, yielding two discrete Mn–O distance in contrast to structural data obtained for bulk LaMnO 3, in which there are three discrete Mn–O distances. Thin films of La 1− x Sr x MnO 3 were deposited by pulsed laser ablation technique on (100) LaAlO 3, (1000) sapphire and polycrystalline alumina substrates. The deposition parameters were optimized to realize the growth of high-quality films. Films deposited on (100) LaAlO 3 were highly c-axis-oriented while the films on (1000) sapphire were highly a-axis-oriented. The morphology of the films as studied by atomic force microscopic analysis reveal that the films are highly granular with an average grain size in the range of 100–150 nm.
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