INVESTIGADORES
MOGNI Liliana Veronica
artículos
Título:
Metal/oxide composites: mechanisms of the formation from the thermal decomposition of LaNi5
Autor/es:
F. TORRESAN; L. MOGNI; M.R. ESQUIVEL
Revista:
Procedia Materials Science
Editorial:
Elsevier
Referencias:
Año: 2013
ISSN:
2211-8128
Resumen:
The formation of metal/oxide composites from the thermal decomposition of LaNi5 is analyzed by TG and DSC between room temperature and 700 ºC. The reaction products are characterized by XRD, SEM and EDS. Based on the results obtained, the following global mechanisms are proposed:
For temperature range between 160 ºC and 600 ºC
2LaNi5 + 13/2O2 ® La2O3 + 10NiO (1)
For temperature range higher than 600 ºC, two mechanisms were proposed as presented for each following equation:
LaNi5 + 7/2O2® LaNiO3 + 4NiO (2)
2LaNi5 + 7/2O2 ® La2O3 + Ni ® La2O3 + NiO ® LaNiO3 + 10NiO (3)
The conditions that promote the formation of metal/oxide composites are discussed according to these results.