Mössbauer resonance studies in the CaTiO3Ca2Fe2O5 system

A Mössbauer resonance study of the CaTiO₃-Ca₂Fe₂O₅ system - i.e. the Ca₂Fe_2xTi_2?2xO_6?x solid solution (0?x?1) - shows a continuous evolution of the local iron environment over the entire composition range. For 0.50?x?1 the investigation confirms a previous structural model of alterning layers of octahedra and tetrahedra. For lower concentrations of oxygen vacancies, evidence is given of Fe³⁺ ions randomly distributed in octahedral and even in tetrahedral sites. Titanium atoms apparently have only octahedral surroundings. A long range order is detected when $\text{x}\text{? 0.50}$.