Interplay between phase formation mechanisms and magnetism in the Sr _2FeMoO_(6-δ) metal-oxide compound

摘要

Double perovskites with the structural formula A_2BB′O _(6±δ), especially the strontium ferromolybdate Sr _2FeMoO_(6-δ), have attracted a lot of attention due to their unique magnetic and electrical properties and a possible application in spintronic devices. However, a strict correlation between the functional characteristics of Sr_2FeMoO_(6-δ) and its synthesis technology has been lacking up to date. Thus, we have studied in the present work the crystallization kinetics of Sr_2FeMoO_(6-δ) using reagents with different pre-history as well as the structural and magnetic properties of the obtained compounds. Differences in the crystallization kinetics as well as higher magnetic inhomogeneity of Sr_2FeMoO _(6-δ) synthesised from a mixture of MoO_3, Fe _2O_3, SrCO_3 in comparison with the compound synthesised from the SrFeO_(2.5) and SrMoO_(4-y) precursors have been found and interpreted.