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Particle Growth during Calcination of Polycation Oxides Synthesized by the Polymeric Precursors Method
Author(s) -
Leite Edson R.,
Nobre Marcos A. L.,
Cerqueira Marinalva,
Longo Elson,
Varela Jose Arana
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb03167.x
Subject(s) - calcination , materials science , particle (ecology) , chemical engineering , particle size , kinetics , crystallization , activation energy , diffusion , zirconium , crystal growth , mineralogy , chemistry , crystallography , catalysis , metallurgy , thermodynamics , organic chemistry , oceanography , physics , quantum mechanics , engineering , geology
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.