Abstract
Se prepararon películas delgadas de manganita de lantano (LaMnO3) mediante el método Sol-gel para la tecnología del imán. Se sintetizaron soluciones precursoras con bajos ángulos de contacto a partir de sales de nitrato de los respectivos cationes (La, Mn), utilizando etanol como disolvente y acetil acetona como agente quelante. Se depositó una película amorfa y densa sobre sustrato de silicio (Si). La cristalización de las láminas se llevó a cabo a temperaturas entre 850 y 1000 ºC. El comportamiento térmico, especies químicas, microestructura y propiedades magnéticas se determinaron mediante TG / DTA, FTIR, XRD, XPS, SEM y VSM respectivamente. Los resultados muestran que láminas policristalinas de perovskita crecieron sobre los sustratos de Si orientados en el plano [100]. Finalmente, las láminas muestran un comportamiento ferromagnético.
Highlights
Ferroelectric materials offer a wide range of useful properties
Ferroelectrics can be made in a wide variety of forms, including ceramics, single crystals, polymers and thin films increasing their exploitability (Yamamoto, 2000)
LaMnO3 has been synthesized by the sol–gel method using ethanol as solvent and characterized for determined thermal, physical, mechanical, magnetic property and structural properties
Summary
Ferroelectric materials offer a wide range of useful properties. These include ferroelectric hysteresis (used in nonvolatile memories), high permittivity’s (used in capacitors), high piezoelectric effects (used in sensors, actuators and resonant wave devices such as radio-frequency filters), high pyroelectric coefficients (used in infra-red detectors), strong electro-optic effects (used in optical switches) and anomalous temperature coefficients of resistivity (used in electric-motor overload protection circuits) (Setter et al, 2006). The A cation will be around 1.2–1.6 Å in radius (similar to the oxygen ions) whilst the B cations perovskite-type oxides have attracted great interest in both applied and fundamental areas of solidstate chemistry, physics, advanced materials and catalysis (Monterrubio-Badillo et al, 2006). LaMnO3 has been synthesized by the sol–gel method using ethanol as solvent and characterized for determined thermal, physical, mechanical, magnetic property and structural properties
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