Combustion Synthesis And Characterization Of Sr3al2o6

In this paper, the synthesis by solution combustion (SCS) of tri-strontium aluminates (Sr3Al2O6), using different fuel amounts, has been studied. The main objective was to understand the effect of the amount of fuel on phase formation, yield and purity of the product using urea as fuel. The combustion temperatures of each reaction were followed by digital pyrometry. Phase compositions were determined by X-ray diffraction (XRD). The microstructural characteristics during the SCS process were studied by field emission scanning electron microscopy (FESEM). The specific surface area was calculated with the BET model from adsorption data. The results showed that the Sr3Al2O6 was the main phase obtained in all syntheses. This aluminate with high content of Sr is considered attractive for use in applications requiring radiopacity as biomaterials for dental and bone repair. The maximum measured temperature during synthesis, with excess fuel, was approximately 987 degrees C. It was higher than that obtained in the case of using stoichiometric amounts of fuel which was 762 degrees C. The product obtained in this second case had a submicrometer structure, with highly crystalline particles and a specific surface of 0.21 m(2)/g. It was higher than that obtained with excess of fuel (0.07 m(2)/g).