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Aluminum Titanate Formation by Solid‐State Reaction of Fine Al 2 O 3 and TiO 2 Powders
Author(s) -
FREUDENBERG BERNHARD,
MOCELLIN ALAIN
Publication year - 1987
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.1151-2916.1987.tb04849.x
Subject(s) - nucleation , materials science , titanate , activation energy , diffusion , kinetics , chemical engineering , aluminium , particle (ecology) , solid state , mineralogy , chemistry , metallurgy , thermodynamics , ceramic , oceanography , organic chemistry , quantum mechanics , engineering , geology , physics
The formation of Al 2 TiO 5 has been studied in equimolar Al 2 O 3 ‐TiO 2 powder mixtures of ∼1μm particle sizes and moderate purity (∼99.8 wt%) at temperatures around 1300°C, where the free energy of formation is very small. Micro‐structural development and reaction kinetics indicate that different mechanisms operate depending on the advancement of the reaction. The rapid initial reaction stage is interpreted as the nucleation‐growth of Al 2 TiO 5 cells in a virtually non‐reacting matrix. The final reaction stage corresponds to the slow diffusion‐controlled elimination of Al 2 O 3 and TiO 2 dispersoids trapped during the growth of the initial Al 2 TiO 5 cells.