The effects of Bi0.5Na0.5TiO3 (BNT) doping on the dielectric properties and microstructures of BaTiO3 (BT)-Nb2O5-ZnO ternary system were investigated. The Δ C/C25℃ values at low temperature (-55℃) decrease with increasing BNT content, but the Δ C/C25℃ values at high temperature (150℃) and the Curie temperature (Tc) show continuous enhancement. BaTiO3 ceramic doped with 1.0wt% and 2.5wt% BNT are satisfied with the EIA X8R specification. SEM indicates that the BaTiO3 ceramics are composed of fine grains and secondary phase grains. Moreover, the proportion of the secondary phase grains increases as BNT contents increase. XRD analyses prove that the fine grains are BaTiO3 and the secondary phase grains are identified to be CaB2Si2O8 and NaBiTi6O14. The formation of the strip-shaped secondary phase of CaB2Si2O8 and NaBiTi6O14 which alters the internal stress system of BaTiO3 ceramics is presumed to be the factor that shifts the Tc to higher temperature and improves the temperature characteristic of BaTiO3 ceramics.
DU Min
,
YUAN Ying
,
ZHANG Shu-Ren
,
TANG Bin
,
LI Yan-Rong
. Effects of Bi0.5Na0.5TiO3 Addition on the Dielectric Properties of BaTiO3-Nb2O5-ZnO System[J]. Journal of Inorganic Materials, 2008
, 23(2)
: 267
-270
.
DOI: 10.3724/SP.J.1077.2008.00267
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