“…21−29 In STFO, replacing Ti 4+ by iron as Fe 3+ creates negatively charged defects (Fe Ti ′ ), 24,27,29−31 which are compensated by the formation of oxygen vacancies, leading to an increase in ionic conductivity. 32,33 In the case of transition metal oxides, oxygen vacancies are generally electron donors, and in STO, oxygen vacancies are particularly important because they have a tendency to retain high carrier mobilities, even at elevated carrier densities. 34 The requirement for easy integration of this material into electronic devices makes the synthesis of high-quality STFO nanostructures interesting from both applied and fundamental standpoints.…”