57Fe and 151Eu Mössbauer study of charge disproportionation and magnetic properties in Eu 1/3Sr 2/3FeO 3

• Published in: Journal of alloys and compounds Vol. 474; no. 1; pp. 229 - 232
• Main Authors: Huang, Yan-Jun, Chen, Nan, Lin, Gui-Xia, Hsia, Yuan-Fu
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2009
• Subjects: Hyperfine interactions; Magnetically ordered materials; Mössbauer spectroscopy; 82.80.Ej; Magnetically ordered materials; Mössbauer spectroscopy; 76.30.Da; Hyperfine interactions; 76.80.+y
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2008.06.051

In this work, the study on charge disproportionation and magnetic property in perovskite sample, Eu 1/3Sr 2/3FeO 3, is presented. The sample was prepared by conventional method of solid-state reaction and was found as a single phase with orthorhombic structure. 57Fe and 151Eu Mössbauer spectra have been measured at the temperatures ranging from 360 K to 15 K. The intensity ratio of the 57Fe Mössbauer spectra corresponding to the Fe 3+ and Fe 4+ at paramagnetic state is found with the ratio 60:40, and a typical ratio corresponding to Fe 3+ and Fe 5+ is observed as about 70:30 below 90 K, which indicates charge disproportionation (CD) as 2Fe 4+ → Fe 3+ + Fe 5+ and a typical magnetic relaxation phenomenon have taken place between 270 K and 90 K. Also, the much broadened absorption peaks with decreasing temperature at 151Eu Mössbauer spectra provide another evidence of magnetic relaxation properties in this compound.