In this work pure and doped LMO were prepared using modified Pechini method from
lanthanum and manganese citrates. Lanthanum citrate was prepared starting from La2O3, while
manganese citrate was prepared from Mn(NO3)2. Valence state of the manganese was controlled by
adjusting pH value of the solution and confirmed by EPR and UV/VIS analysis. Thermal treatment
conditions for preparation of LMO powders were determined from TG/DTA of dried precursors.
XRD results confirmed that pure perovskite phase was successfully prepared in single LMO and Cadoped
LMO. SEM and measurements of specific surface area of the powders showed the existence
of large agglomerates consisting of submicronic primary particles.
SummaryLaNiO 3 thin films were successfully prepared by a chemical method from citrate precursors. The LNO precursor solution was spin-coated onto Si (100) and Si (111) substrates. To obtain epitaxial or highly oriented films, the deposited layers were slowly heated in a gradient thermal field, with a heating rate of 1 • min −1 , and annealed at 700 • C. The influence of different substrate orientations on the thin film morphology was investigated using atomic force microscopy and X-ray diffraction analysis. Well-crystallized films with grains aligned along a certain direction were obtained on both substrates. Films deposited on both substrates were very smooth, but with a different grain size and shape depending on the crystal orientation. Films deposited on Si (100) grew in the (110) direction and had elongated grains, whereas those on Si (111) grew in the (211) direction and had a quasi-square grain shape.
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