Abstract
This work reports on the synthesis and characterization of NASICON prepared from SiO 2 , Na 3 PO 4 .12H 2 O and two types of zirconia : pure monoclinic ZrO 2 and TZP (Tetragonal Polycrystalline Zirconia, with 3 mol% Y 2 O 3 ) as raw materials. The classical ceramic method was used in all cases. SEM, XRD and DTA were used to follow the synthesis and sintering process, and impedance spectroscopy (IS) was used to study the electrical properties of sintered pellets. Results obtained with different NASICON samples showed a significant role of composition and processing conditions on the electrical properties. Samples based on TZP, sintered at 1210°C, exhibited densities of about 3.20 g/cm 3 (98% of theoretical density of NASICON) and ionic conductivities of about 2x10 -3 S.cm -1 at room temperature a rather interesting result when compared with data obtained with the material prepared from pure ZrO 2 .
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