Structural and Magnetic Characterization of LaFe1-xAlxO3 (x = 0 and 0.2) Orthoferrites Synthesized by Gelatin Method
| Autor: | Osmar Bagnato, A. C. Lima, A. F. Costa, J. L. S. Dutra, Patrícia Mendonça Pimentel, J.H. Araújo, Rosane Maria Pessoa Betânio Oliveira |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
food.ingredient Scanning electron microscope Mechanical Engineering Doping Analytical chemistry 02 engineering and technology Coercivity 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Gelatin Nanocrystalline material 0104 chemical sciences Nuclear magnetic resonance food Ferromagnetism Mechanics of Materials Transmission electron microscopy Remanence General Materials Science 0210 nano-technology |
| Zdroj: | Materials Science Forum. 899:227-231 |
| ISSN: | 1662-9752 |
| DOI: | 10.4028/www.scientific.net/msf.899.227 |
| Popis: | The rare-earth orthoferrites (LnFeO3) are promising materials for various applications, such as chemical sensors, cathode for SOFC, catalysts, among others. In general, these oxides are synthesized at temperatures higher than 700 °C. In this work, nanocrystalline LaFe1-xAlxO3 (x=0, x=0.2) powders were synthesized by a method that uses gelatin as organic precursor and heat treated at 400, 600 and 800 °C. The structural and magnetic characterization of powders was carried out by X-ray diffraction (XRD) and vibrating sample magnetometry (VSM). Morphological analysis was performed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The XRD patterns revealed the formation of orthoferrites single phase since 400°C. The powders exhibited weak ferromagnetic behavior at room temperature where the values of saturation magnetization, remanence and coercivity varied with the doping and heat treatment temperature. |
| Databáze: | OpenAIRE |
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