Abstract

RUIZ, VANESSA  and  RODRIGUEZ, JORGE. THE EFFECT OF THE CONTENT OF SODIUM IN THE OBTAINING OF Na⁺-b-ALÚMINA UTILIZED THE POLYMERIC PRECURSOR METHOD. Dyna rev.fac.nac.minas [online]. 2011, vol.78, n.165, pp.190-195. ISSN 0012-7353.

In this work was utilized the Polymeric Precursor method to synthesis ceramic powders of Na⁺-b-alúmina. We were interested in determinate the initial quantity from sodium precursor and its effect on crystalline phase obtained. Powders obtained were characterized using Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The effect of the initial quantity of sodium in the sample was very important in the nature of the final product. If we used one stoichiometric quantity of NaOH, to obtain NaAl₁₁O₁₇ compound, we obtained a-alúmina as finish product (1450ºC). On the other hand, b-alúmina and/or Na₂Al_2xO_3x-1 were obtained in samples treated thermicalment from 1000ºC to 1350ºC. When we used a higher quantity of NaOH, sample non-stoichiometric, a solid with NaAl₁₁O₁₇ as majority phase was obtained.

Keywords : Na⁺-b-alúmina; stoichiometric; non-stoichiometric; polymeric precursor.

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