Zero-dimensional  deficiency in Sr₂FeMoO_6-δ structure

One can see from experimental results that magnetic moments of the double perovskite are lower than the theoretically calculated ones. This discrepancy can be explained by the formation of antisite point defects, such as [Fe]_Mo, [Mo]_Fe or of oxygen vacancies (V₀).

This should lead to the change of the type of exchange interactions. Therefore it is important to maintain the appropriate partial oxygen pressure taking into account synthesis conditions.