Formation of Fe4+ based on the Fe-O bond lengths in perovskite Eu1-xSrxFeO3 Raihan Mohammad Rahman (a*), Mochammad Yan Pandu Akbar (a), Mohammad Dani Al Qori (b), Agustinus Agung Nugroho (c)
(a) Physics Graduate Program, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia
(b) Badan Riset dan Inovasi Nasional, Indonesia
(c) Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia
Abstract
The physical properties of high oxidation state of trantition metal oxide compound have attracted many research interest for its potential applications. A systematic investigation of Fe4+ in Eu1-xSrxFeO3 with x = 0, 0.1, 0.2, 0.3, and 0.4 has been carried out in polycrystaline form obtained using sol-gel method. The single phase of Eu1-xSrxFeO3 is observed up to x = 0.3. The X-Ray powder pattern for low Sr content of x = 0.1, is best refined by using EuFeO3 crystal structure with Sr occupied the Eu-site. On the other hand, for higher Sr contents, two phases of EuFeO3 and Eu1/3Sr2/3FeO3 are required to obtained the best refinement. The result of the refinements showed that the volume and the average bond legths of Fe-O decreases as increasing the Sr content. These results are consistent to support the existance of Fe4+ upon Sr doping in Eu1-xSrxFeO3. For the Sr content of x = 0.1, an anomalous change of the volume is observed. The present of this anomaly is confirmed using different synthesis route which indicates that the anomaly is intrinsic.
