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Ferroelectric BaTiO 3 nanoceramics prepared by a three‐step high‐pressure sintering method
Author(s) -
Xiao C. J.,
Zhang W. W.,
Chi Z. H.,
Li F. Y.,
Feng S. M.,
Jin C. Q.,
Wang X. H.,
Li L. T.,
Chen R. Z.
Publication year - 2007
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200622399
Subject(s) - materials science , ferroelectricity , sintering , ceramic , dielectric , microstructure , grain size , relative density , phase (matter) , ferroelectric ceramics , phase transition , diffraction , mineralogy , barium titanate , analytical chemistry (journal) , composite material , optics , condensed matter physics , chemistry , optoelectronics , physics , organic chemistry , chromatography
Dense BaTiO 3 nanoceramics with a homogeneous grain size of 30 nm were prepared at 6 GPa, 1000 °C using a three‐step high‐pressure sintering method. The microstructure of the ceramics obtained is uniform and the relative density is above 98% of the theoretical value. Similar to normal BaTiO 3 ceramics, successive phase transitions are observed in the 30 nm BaTiO 3 ceramics using variable‐temperature X‐ray diffraction measurements. Furthermore the 30 nm BaTiO 3 ceramics reveal ferroelectric properties after being post‐annealed at low temperature in O 2 atmosphere, but the phase transition temperature from paraelectric to ferroelectric phase is 10 °C lower than that of a normal bulk sample. The results indicate that dense 30 nm BaTiO 3 ceramics retain ferroelectricity above room temperature. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)