Evolution of Iron Electronic State in the Solid Solutions Gd2-xSr1+xFe2O7-δ
The present study is devoted to the non-isovalent substitution of Gd+3 for Sr+2 in matrix of Gd2-xSr1+xFe2O7 with perovskite-type intergrowth structure and to the investigation of oxidation state of iron depending on the method of synthesis and the content of solid solutions. Mössbauer spectroscopy showed the difference in the structure of complex ferrite Gd2SrFe2O7 obtained by ceramic technology (iron in single Fe+3 magnetically ordered state) from oxides obtained by the sol - gel technology (Fe+3 in the three different surroundings and presence of Fe+4).
Yuriy Verbovytskyy and António Pereira Gonçalves
A. Shilova et al., "Evolution of Iron Electronic State in the Solid Solutions Gd2-xSr1+xFe2O7-δ", Solid State Phenomena, Vol. 194, pp. 116-119, 2013