Investigation into the Influence of Substitutions on the Structural Characteristics of Sr₂FeMoO₆

Sr₂FeMoO₆ is a half-metallic ferromagnet with a high Curie temperature, which positions it as a strong candidate for spintronic devices. Its lattice features ordered Fe and Mo cations on the B sites, and this arrangement underpins distinctive electronic transport and robust magnetic exchange. Here we examine Sr₂FeMoO₆ and the substituted phases Sr₂FeMo₁₋ₓTaₓO₆ with x=0.05 and Sr₂FeMo₁₋ₓVₓO₆ with x = 0.15 by neutron diffraction across multiple temperatures. The data show that temperature and B-site substitution drive measurable changes in unit-cell metrics and anisotropy. These results clarify the structural and thermal responses of this double perovskite family and inform their use in technology. Keywords: neutron diffraction, rietveld refinement, substitutions, low temperature

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