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Dedensification and Anomalous Grain Growth during Sintering of Undoped Barium Titanate
Author(s) -
Demartin Marlyse,
Hérard Claude,
Carry Claude,
Lemaître Jacques
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.tb02949.x
Subject(s) - ostwald ripening , sintering , materials science , grain growth , barium titanate , ultimate tensile strength , isotropy , anisotropy , porosity , abnormal grain growth , mineralogy , composite material , grain size , metallurgy , ceramic , nanotechnology , chemistry , physics , quantum mechanics
Dedensification (up to 10% of the theoretical density in some instances) occurs at temperatures of .1320°C during the sintering of commercial undoped BaTiO 3 powders. The expansion of the rigid, interconnected network of large, rounded grains that grow by the Ostwald ripening effect can explain the dedensification that is observed. The isotropic anomalous grain growth results from the appearance of a liquid phase at } 1320°C and induces tensile stresses on the residual porous fine‐grained matrix. No dedensification was observed at temperatures of, 1320°C, despite anisotropic anomalous grain growth.