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Particle Growth during Calcination of Polycation Oxides Synthesized by the Polymeric Precursors Method

1997; Wiley; Volume: 80; Issue: 10 Linguagem: Inglês

10.1111/j.1151-2916.1997.tb03167.x

1551-2916

Edson R. Leite, Marcos A.L. Nobre, Marinalva Cerqueira, E. Longo, J.A. Varela,

Pigment Synthesis and Properties

The particle‐growth kinetics of sodium niobate and zirconium titanate powders that were processed by the polymeric precursors method were studied. The growth kinetics that were studied for the particle, in the final stage of crystallization, showed that the growth process occurs in two different stages. For temperatures <800°C, the particle‐growth mechanism is associated with surface diffusion, with an activation energy in the range of 40‐80 kJ/mol. For temperatures >800°C, particle growth is controlled by densification of the nanometric particle clusters and by a neck‐size‐controlled particle‐growth mechanism. The results suggest that this behavior was typical of the synthesis method, because two different polycation oxides presented the same behavior.