Microstructure and dielectric properties of highly tunable Ba 0.6Sr 0.4TiO 3/MgO/Al 2O 3/ZnO composite

Guoxin Hu, Feng Gao, Liangliang Liu, Bei Xu, Zhengtang Liu

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)44-50
Number of pages7
JournalJournal of Alloys and Compounds
Volume518
DOIs
StatePublished - 25 Mar 2012

Keywords

  • Barium strontium titanate
  • Dielectric properties
  • Paraelectric-ferroelectric
  • Tunability

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