SrSn0.95Fe0.05O3 films were grown on oxidized silicon and quartz substrates by RF sputtering technique. The electronic transport and optical properties of the films were investigated. The temperature dependence of electronic conductivity has been analyzed quantitatively using Mott's small polaron hopping model in the temperature range Room Temperature (RT) −240 K and variable range hopping model in the temperature range 240-190 K.

Perovskite-type strontium stannate, SrSnO3, is of technological interest because of its potential applications. In the present work, Fe(III)-doped SrSnO3 perovskites were synthesized using Sn metal and the polymeric precursor method, derived from the Pechini method. Thermogravimetric evaluations in N2 and O2 atmospheres were performed to evaluate the possible formation of oxygen vacancies resulting from Fe(III) doping. The X-ray diffraction patterns showed the formation of an orthorhombic structure with high crystallinity after calcination at 1,073 K. The first thermal analysis, in a N2 atmosphere, led to the partial elimination of strontium carbonate and hydroxyl groups, while the thermal analysis in an O2 atmosphere led to an increase in the mass, indicating O2 adsorption on the lattice, which could be related to the presence of Fe(III) and Fe(IV) in the perovskite structure. Moreover, the thermal analysis changed the symmetry of the iron-doped perovskites.

The optical and electronic transport properties of SrSn0.95Fe0.05O3 films

Citations

Structural changes in Fe-doped SrSnO 3 perovskites during thermal analysis

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