LaCoO3 formation from precursors obtained by water-based sol–gel method with citric acid
- 314 Downloads
In the present work the LaCoO3 formation from gel precursors obtained by water-based sol–gel method with citric acid was studied. As precursors La and Co nitrates were used. The obtained gels were analyzed by TG/DTA and TG/AGE. The decomposition of the gels takes place in two main steps with the evolution of the same volatile compounds (H2O, CO2 si NO2) leading to the conclusion that two types of bonding of the components in the gels occurred. The decomposition of the gels takes place up to 400 °C. The gels thermally treated at 600 °C lead to single pure perovskite rhombohedral phase of lanthanum cobalt oxide (LaCoO3).
KeywordsSol–gel processes LaCoO3 TG/AEG Phase formation
- 12.Tsai MT. Effects of hydrolysis processing of the characterization of forsterite gel fibers. Part I. Preparation, spinability and molecular structure. J Eur Ceram Soc. 2002;22:3–19.Google Scholar
- 13.Livage J, Henry M, Sanchez C. Sol-gel chemistry of transition metal oxides. J Non-Cryst Solids. 1988;18:259–341.Google Scholar