Sol-gel synthesis of cubic Nb/Ta-doped SrCoO3-δ with mixed nano-micro morphology

F.M. EROLES; D.G. LAMAS. ; A.D. MENZAQUE; V.C. FUERTES; W.J. PELÁEZ

Materials Research Express

IOP Publishing Ltd

Año: 2019 p. 1 - 9

2053-1591

ARTÍCULO ENVIADO PARA SU PUBLICACIÓNSrCo0.90M0.10O3-d (M= Nb, Ta) perovskite powders were synthesized by sol-gel,using tartrate-precursor decomposition. The crystal structure of these materials was analyzed by X-ray powder diffraction. Rietveld refinements showed that both samples achieved the cubic crystal structure (Pm-3m), which was stabilized by the incorporation of highly-charged transition-metal cations at the octahedral sites. This synthesis method successfully lowered the calcination temperature relative to other methods mentioned in literature. The concentration of oxygen vacancies ( value) was determined by thermogravimetric analysis. Microstructural analysis done by FE-SEM revealed micrometric scale particles with a superficial nanometric dendritic array. The present work provides a new strategy to synthesize nanostructured perovskite materials.