Aurivillius phases of the type Bi2Sr2Nb2TiO12 and Bi1.6Pb0.4Sr2Nb2Ti1-xAlxO12 (0.0 ≤ × ≤ 0.8) were synthesized by the polymerized complex method involving an organometallic precursor. The effect of raising the pH of the solution was investigated through the addition of ammonium hydroxide. Infrared spectroscopy was taken at various points in the reaction to generate a mechanism. The IR data showed the formation of an ester as well as an amide with the addition of ammonium hydroxide. Pure Bi2Sr2Nb2TiO12 was formed after heat treatment for 5 hours at 900°C for the unaltered solution and 5 hours at 700°C when the solution pH was raised to 9.00. A solubility limit of aluminum was determined for Bi1.6Pb0.4Sr2Nb2Ti1-xAlxO12 when x ≥ 0.4. Conductivity measurements at 1123 K of Bi1.6Pb0.4Sr2Ti1-xAlxO12 range from 4.76 × 10-3 S•cm-1 at x = 0.8 to 1.74×10-4 S•cm-1 at x = 0.1.
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Luisi, B.S., Misture, S.T. Synthesis of Aurivillius Ceramics by the Polymerized Complex Method. MRS Online Proceedings Library 756, 35 (2002). https://doi.org/10.1557/PROC-756-FF3.5