TY - JOUR
T1 - Microstructure and dielectric properties of Ba0.6Sr 0.4TiO3-MgAl2O4 composite ceramics
AU - Hu, Guoxin
AU - Gao, Feng
AU - Liu, Liangliang
AU - Cao, Xiao
AU - Liu, Zhengtang
PY - 2011/5
Y1 - 2011/5
N2 - (1 - x)Ba0.6Sr0.4TiO3-xMgAl 2O4(x = 25, 30, 35 and 40 wt%) composite ceramics were prepared by conventional solid-state reaction method. The microstructures, dielectric properties and tunability of the composites have been investigated. The XRD patterns analysis reveals two crystalline phases, a cubic perovskite structure Ba0.6Sr0.4TiO3 (BST) and a spinel structure MgAl2O4 (MA). SEM observations show that the BST grains slightly dwindle and agglomerate with increasing amounts of MA. A dielectric peak with very strong frequency dispersion is observed at higher MA content, and the Curie temperature shifts to a higher temperature with increasing MA content. The ceramic sample with 30 wt% MA has the optimized properties: the dielectric constant is 1503, the dielectric loss is 0.003 at 10 kHz and 25 °C, the tunability is 23.63% under a dc electric field of 1.0 kV/mm, which is suitable for ferroelectric phase shifter.
AB - (1 - x)Ba0.6Sr0.4TiO3-xMgAl 2O4(x = 25, 30, 35 and 40 wt%) composite ceramics were prepared by conventional solid-state reaction method. The microstructures, dielectric properties and tunability of the composites have been investigated. The XRD patterns analysis reveals two crystalline phases, a cubic perovskite structure Ba0.6Sr0.4TiO3 (BST) and a spinel structure MgAl2O4 (MA). SEM observations show that the BST grains slightly dwindle and agglomerate with increasing amounts of MA. A dielectric peak with very strong frequency dispersion is observed at higher MA content, and the Curie temperature shifts to a higher temperature with increasing MA content. The ceramic sample with 30 wt% MA has the optimized properties: the dielectric constant is 1503, the dielectric loss is 0.003 at 10 kHz and 25 °C, the tunability is 23.63% under a dc electric field of 1.0 kV/mm, which is suitable for ferroelectric phase shifter.
KW - Barium strontium titanate
KW - C. Dielectric properties
KW - Composite ceramics
KW - Frequency dispersion
KW - Tunability
UR - http://www.scopus.com/inward/record.url?scp=79952985890&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2010.12.018
DO - 10.1016/j.ceramint.2010.12.018
M3 - 文章
AN - SCOPUS:79952985890
SN - 0272-8842
VL - 37
SP - 1321
EP - 1326
JO - Ceramics International
JF - Ceramics International
IS - 4
ER -