MAGNETORESISTIVE LA0.83SR0.17MNO3 CERAMICS BY DAAS TECHNIQUE

Manganese-based perovskites have been successfully synthesized using d eposition by aqueous acetate solution (DAAS). This novel technique, wh ich has the potential for depositing large area thin films with high t hroughput and low cost, involves the preparation of stoichiometric mix tures of metal-acetate precursor solutions, followed by the subsequent firing of these mixtures at relatively low temperature (600 degrees C ) for short periods of time (< 100 min), to produce crystalline lantha num-strontium-manganate (LSMO) materials. For La0.83Sr0.17MnO3 perovsk ites, varying the firing temperature from 600 to 900 to 1200 degrees C (while maintaining a constant firing time of 100 min) results in an i ncrease in product crystallite size (from similar to 160 to similar to 3300 Angstrom), a sharpening and a shift toward higher temperatures o f the metallic transition, a decrease in the material resistivity meas ured at 350 K (by I order of magnitude for each temperature studied, a nd a change in the XRD 2 theta peaks consistent with a material phase transition. Lattice parameters, magnetic dependent resistivities, meta llic and ferromagnetic transition temperatures, and magnetization valu es are comparable to those of LSMO materials prepared by much harsher, conventional. methods. The advantages of using the DAAS technique for synthesizing manganese-based perovskites, in particular for thin/thic k films, will be discussed.