Abstract
Perovskite nanoparticles MSnO3 (M = Ba, Zn, Ca) were synthesized at low temperature in a controllable and reproducible way, using the polymer complex method. The physicochemical, structural and optical characteristics of the mixed oxides were determined using DTA/GTA, XRD, FTIR, SEM/TEM, DRS and XPS. The pure crystalline phases were obtained between 700 and 800 °C, with particle size less than 80 nm, a spheroidal morphology in the BaSnO3 and ZnSnO3, and laminar in the CaSnO3. The band-gap energy between 3.4 and ~4.6 eV were obtained. Urbach energy (Eu) was calculated to determine the degree of disorder of the synthesized perovskites, with BaSnO3 giving the highest Eu value (417 meV). This result indicates the existence of defects, e.g. oxygen vacancies, a condition that was verified by deconvolution and analysis of XPS spectra. Considering the nature of the synthesis process and the results obtained, a mechanism was proposed to explain the formation of the perovskites.
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