TY - JOUR
T1 - The temperature-dependent piezoelectric and electromechanical properties of cobalt-modified sodium bismuth titanate
AU - Wang, Chun Ming
AU - Zhao, Liang
AU - Liu, Yun
AU - Withers, Ray L.
AU - Zhang, Shujun
AU - Wang, Qian
N1 - Publisher Copyright:
© 2015 Elsevier Ltd and Techna Group S.r.l.
PY - 2016/2/15
Y1 - 2016/2/15
N2 - Lightly cobalt-modified, Aurivillius-type, sodium bismuth titanate (Na0.5Bi4.5Ti4O15, NBT) ceramics were synthesized by substituting a small amount of cobalt ions onto the Ti4+ sites using conventional solid-state reaction. X-ray photoelectron spectroscopy (XPS) analysis coupled with bond valence sum calculations show that the dopant cobalt ions substitute for Ti4+ ions in the form of Co3+. The resultant cobalt-modified NBT ceramics (NBT-Co) exhibit better piezoelectric and electromechanical properties by comparison with pure NBT. With only 0.3 wt% Co3+ substitution, the piezoelectric properties of the NBT-Co ceramics are optimal, exhibiting a high piezoelectric coefficient (d33~33 pC/N), a low dielectric loss tan δ (~0.1% at 1 kHz), a high thickness planar coupling coefficient (kt~34%) as well as a high Curie temperature (Tc~663 °C). Such NBT-Co ceramics exhibit nearly temperature-independent piezoelectric and electromechanical properties up to 400 °C, suggesting that these cobalt-modified NBT ceramics are promising materials for high temperature piezoelectric applications.
AB - Lightly cobalt-modified, Aurivillius-type, sodium bismuth titanate (Na0.5Bi4.5Ti4O15, NBT) ceramics were synthesized by substituting a small amount of cobalt ions onto the Ti4+ sites using conventional solid-state reaction. X-ray photoelectron spectroscopy (XPS) analysis coupled with bond valence sum calculations show that the dopant cobalt ions substitute for Ti4+ ions in the form of Co3+. The resultant cobalt-modified NBT ceramics (NBT-Co) exhibit better piezoelectric and electromechanical properties by comparison with pure NBT. With only 0.3 wt% Co3+ substitution, the piezoelectric properties of the NBT-Co ceramics are optimal, exhibiting a high piezoelectric coefficient (d33~33 pC/N), a low dielectric loss tan δ (~0.1% at 1 kHz), a high thickness planar coupling coefficient (kt~34%) as well as a high Curie temperature (Tc~663 °C). Such NBT-Co ceramics exhibit nearly temperature-independent piezoelectric and electromechanical properties up to 400 °C, suggesting that these cobalt-modified NBT ceramics are promising materials for high temperature piezoelectric applications.
KW - Aurivillius type
KW - Bismuth layer-structured ferroelectrics
KW - Piezoelectric ceramics
KW - Sodium bismuth titanate
UR - http://www.scopus.com/inward/record.url?scp=84951910718&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2015.11.103
DO - 10.1016/j.ceramint.2015.11.103
M3 - Article
SN - 0272-8842
VL - 42
SP - 4268
EP - 4273
JO - Ceramics International
JF - Ceramics International
IS - 3
ER -