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Dielectric Properties and Microstructure of Nb‐Co Codoped BaTiO 3 –(Bi 0.5 Na 0.5 )TiO 3 Ceramics
Author(s) -
Hsiang HsingI.,
Mei LiThen,
Chun YiJih
Publication year - 2009
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.1551-2916.2009.03245.x
Subject(s) - curie temperature , microstructure , materials science , dielectric , scanning electron microscope , ceramic , transmission electron microscopy , analytical chemistry (journal) , mineralogy , grain size , barium titanate , composite material , condensed matter physics , nanotechnology , chemistry , optoelectronics , ferromagnetism , physics , chromatography
X‐ray diffractometry, scanning electron microscopy, transmission electron microscopy, and an impedance analyzer were used to examine the Nb–Co codoping effects on the densification, crystalline phase, microstructure development, and dielectric–temperature characteristics of BaTiO 3 –(Bi 0.5 Na 0.5 )TiO 3 ceramics. The results indicate that the Curie temperature shifted to a higher temperature (above 140°C) by adding BNT. The dielectric constant–temperature (ɛ– T ) curve broadened at the Curie temperature due to the small grain size (0.3–0.4 μm). A core‐shell structure was developed, which is helpful to flatten the ɛ– T curve of BaTiO 3 ceramics at high temperatures.