Structural defects in AFe2O4 (A = Zn, Mg) spinels

(Zn2+/Mg2+)[Fe3+]2O4 spinel oxides can be refined as direct/fully inverted (respectively) spinels but considering cationic and anionic vacancies and/or interstitial atoms instead of a partial inversion rate of the A2+ and B3+ cations. The refinements results of the X-ray diffraction patterns and Mِssbauer spectroscopy spectra are discussed and show the veracity of the new structural formalism.