TY - JOUR
T1 - Microstructure and dielectric properties of highly tunable Ba 0.6Sr 0.4TiO 3/MgO/Al 2O 3/ZnO composite
AU - Hu, Guoxin
AU - Gao, Feng
AU - Liu, Liangliang
AU - Xu, Bei
AU - Liu, Zhengtang
PY - 2012/3/25
Y1 - 2012/3/25
N2 - The effect of co-doping ZnO, Al 2O 3 and MgO on the microstructures and dielectric properties of Ba 0.6Sr 0.4TiO 3 ceramics prepared by the mixed-oxide route at 1400 °C was investigated. And a comparison criterion for the BST-based tunable ceramics was proposed. The results show that a cubic perovskite phase Ba 0.6Sr 0.4TiO 3 and a face-centered-cubic spinel phase Mg(Zn)Al 2O 4 were observed in BST/MgO/Al 2O 3/ZnO (BMAZ) composite ceramics. When Zn 2+ content exceeds solid solubility limit in the BST, excess ZnO will react with Al 2O 3 to produce ZnAl 2O 4 phase. With the increase of ZnO, the paraelectric-ferroelectric phase transition points of BMAZ ceramics shift to the lower temperatures, and the maximum of dielectric constant increased first and then decreased. A higher tunability which amounts to 27.4% under 1.0 kV/mm biasing was obtained for BMAZ ceramics doped with 1.0 wt% ZnO.
AB - The effect of co-doping ZnO, Al 2O 3 and MgO on the microstructures and dielectric properties of Ba 0.6Sr 0.4TiO 3 ceramics prepared by the mixed-oxide route at 1400 °C was investigated. And a comparison criterion for the BST-based tunable ceramics was proposed. The results show that a cubic perovskite phase Ba 0.6Sr 0.4TiO 3 and a face-centered-cubic spinel phase Mg(Zn)Al 2O 4 were observed in BST/MgO/Al 2O 3/ZnO (BMAZ) composite ceramics. When Zn 2+ content exceeds solid solubility limit in the BST, excess ZnO will react with Al 2O 3 to produce ZnAl 2O 4 phase. With the increase of ZnO, the paraelectric-ferroelectric phase transition points of BMAZ ceramics shift to the lower temperatures, and the maximum of dielectric constant increased first and then decreased. A higher tunability which amounts to 27.4% under 1.0 kV/mm biasing was obtained for BMAZ ceramics doped with 1.0 wt% ZnO.
KW - Barium strontium titanate
KW - Dielectric properties
KW - Paraelectric-ferroelectric
KW - Tunability
UR - https://www.scopus.com/pages/publications/84862801755
U2 - 10.1016/j.jallcom.2011.12.105
DO - 10.1016/j.jallcom.2011.12.105
M3 - 文章
AN - SCOPUS:84862801755
SN - 0925-8388
VL - 518
SP - 44
EP - 50
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -