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Bi 4 Ti 3 O 12 Ceramics from Powders Prepared by Alternative Routes: Wet No‐Coprecipitation Chemistry and Mechanochemical Activation
Author(s) -
Algueró M.,
Ferrer P.,
Vila E.,
Iglesias J. E.,
Castro A.
Publication year - 2006
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.1551-2916.2006.01234.x
Subject(s) - coprecipitation , ceramic , materials science , sintering , dielectric , mineralogy , activation energy , electroceramics , grain size , analytical chemistry (journal) , chemical engineering , metallurgy , inorganic chemistry , chemistry , environmental chemistry , fabrication , engineering , medicine , microfabrication , alternative medicine , optoelectronics , pathology
The processing of ferroelectric Bi 4 Ti 3 O 12 ceramics from powders prepared by wet no‐coprecipitation chemistry (WNCC) and mechanochemical activation (MCA) has been investigated. Dense ceramics were obtained at sintering temperatures as low as 900°C. Exaggerated grain growth was observed for samples from WNCC, but not for those from MCA. Dielectric properties are discussed in relation to the type and concentration of defects, which is smaller for ceramic samples from WNCC. The activation energy of the dielectric relaxation for ceramics from MCA suggests that additional V O •• are present at the pseudoperovskite [Bi 2 Ti 3 O 10 ] 2− block in this case.