Síntese e caracterização do Sr1-xLaxSnO3
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Data
2013-07-19
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Universidade Federal de Goiás
Resumo
The study of tin compounds, especially tin compounds containing rare earths as a
substituent, has intensified due to their properties with a broad scope, including:
electrical properties, and catalytic photoluminescent. In this work were obtained after
addition of SrSnO3 with La3+ in mole percentages (1, 5 and 10%). The synthetic method
used was the polymeric precursor, which is a viable alternative for obtaining ceramic
materials with nanoscale phase and perovskite type structure. The powders were heattreated
at 300, 600, 800 and 1000 ° C for 4 hours. The materials were characterized by
thermal analysis (TG / DTG), X-ray Diffraction (XRD), absorption spectroscopy in the
IR and absorption spectroscopy in the region of the UV-Visible, Scanning Electron
Microscopy (SEM-FEG), Analysis surface area (BET) and photoluminescence
measurements. The pure samples and with addition of lanthanum present a single phase
with perovskite structure. The decrease the amount of carbonate is related to the
temperature according to the infrared spectrum an increase in the calcination
temperature causes a reduction in the intensity of the peaks relating vibrations carbonate
group. Optical gap of the powders was varied between 3.7 to 3.98 eV. The
photoluminescent emission of higher intensity for sample of the SrSnO3 with addition
of 1% lanthanum calcined at 600 °C.
Descrição
Palavras-chave
Estanato de estrôncio, Mineral perovskita, Materiais cerâmicos
Citação
MENDES, Sara Bambirra. Síntese e caracterização do Sr1-xLaxSnO3. 2013. 73 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Catalão, 2013.