Influence of polymerizing agent on structure and spectroscopic properties of nano-crystalline La0.8Sr0.2MnO3 powders

✍ Scribed by D. A. Macedo; M. R. Cesário; B. Cela; D. M. A. Melo; C. A. Paskocimas; A. E. Martinelli; R. M. Nascimento

• Book ID: 102127531
• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 209 KB
• Volume: 45
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.201000224

✦ Synopsis

Strontium-doped lanthanum manganite (La 1-x Sr x MnO 3 or LSM) is the material most widely used on solid oxide fuel cells cathode. In this work, nano-scale La 0.8 Sr 0.2 MnO 3 powders have been synthesized by polymeric precursor-based methods using different polymerizing agents with the aim of evaluating the influence of this change in the final powder. The powders calcined at 700 °C for 2 h have been characterized by X-ray diffraction (XRD), scanning electron microscopy (FE-SEM) and Fourier transform infrared spectroscopy (FTIR) in order to investigate the quality of both synthesis routes. It is shown that the crystal structure and morphology of the particles are significantly dependent on the preparation conditions. Single phase and La 0.8 Sr 0.2 MnO 3 nano-crystalline particles less than 30 nm were obtained using ethylene glycol as polymerizing agent. FTIR results have been indicated that only the powder obtained using gelatin presented small traces of hydroxyl groups on its surface.