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Grain‐Size Effects on Diffuse Phase Transitions of Sol‐Gel Prepared Barium Titanate Ceramics
Author(s) -
Lobo R. P. S. M.,
Mohallem Nelcy D. S.,
Moreira Roberto L.
Publication year - 1995
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.1151-2916.1995.tb08492.x
Subject(s) - barium titanate , materials science , phase transition , ceramic , grain size , sol gel , ferroelectricity , dielectric , phase (matter) , mineralogy , ferroelectric ceramics , analytical chemistry (journal) , condensed matter physics , composite material , nanotechnology , chemistry , optoelectronics , chromatography , physics , organic chemistry
Barium titanate ceramic samples, obtained by sol‐gel methods, having different grain sizes have been analyzed by diffuse phase transition techniques. We performed a study of the influence of each method on the phase transition interval and on the Landau parameters of the ferroelectric phase transition of these materials. The results show the existence of a relationship between the diffuse character of the transition and the grain size of the sample. The method of fitting dielectric data presented here allows us to compare ceramics with single crystals and then analyze the sol‐gel process used to obtain them.