Oxidation States of Fe in LaNi1-xFexO3

A. E. GOETA; G. F. GOYA; R. C. MERCADER; G. PUNTE; H. FALCÓN; R. E. CARBONIO

Springer

Año: 1994 vol. 90 p. 371 - 371

p style="TEXT-ALIGN: justify; LINE-HEIGHT: normal; MARGIN: 0cm 0cm 0pt; TEXT-AUTOSPACE: ; mso-layout-grid-align: none" class="MsoNormal">The distribution of oxidation states in perovskites of the type LaA l-xBxO3 (A and B transition metal ions) can be "tailored" by x variation. In particular, in LaNiO3 it has been shown that Fe substitution for Ni forces some Ni3+ into Ni2+ while some Fe3+ changes into the unusual Fe4+ state. In addition, the existence of mixed oxidation states of Fe and/or Ni in LaNil-xFexO3 has been related to its catalytic activity in hydrogen peroxide decomposition. The Fe4+ population, obtained using Mössbauer spectroscopy, was found to be constant for all the analyzed annealing temperatures for x = 0.25 concentration, where t