Solution combustion synthesis of La1−xSrxFe1−yCuyO3±w (x=0, 0.2; y=0, 0.2) perovskite nanoparticles: Conventional vs. microwaves ignition

• Published in: Ceramics international 2015-07, Vol.41 (6), p.7803-7810
• Main Authors: Rosa, Roberto, Ponzoni, Chiara, Veronesi, Paolo, Natali Sora, Isabella, Felice, Valeria, Leonelli, Cristina
• Format: Article
• Language: English
• Subjects: A. Microwave processing; A. Powders: chemical preparation; B. Electron microscopy; D. Perovskites
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2015.02.114

La1−xSrxFe1−yCuyO3±w (x=0, 0.2; y=0, 0.2) nanoparticles have been prepared by solution combustion synthesis exploiting both conventional and microwave heating in the ignition of the self-sustaining reactions. Interaction of microwaves with the reaction mixture allowed significant reduction of the ignition time according to the dielectric properties of the precursor gels, which have been measured at room temperature in the 0.5–3GHz frequency range. Both the ignition strategies led to the preparation of crystalline single-phase products without affecting particles morphology. The ignition technique influenced only the average particles size with those prepared by microwaves-ignition, possessing typically larger dimension, as a probable consequence of the higher temperatures reached due to microwave absorbing products. Perfectly crystallised nanoparticles were obtained after combustion syntheses and calcination at 600°C for 3h in the particle size range between 20 and 80nm dependently upon the heating source and the dopant level.