Microwave dielectric properties of sol-gel derived BaTi4O9and Ba2Ti9O20:B2O3ceramics

X. G. Tang, J. Z. Liu, Kin Wing Kwok, H. L.W. Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)


BaTi4O9and B2O3-doped Ba2Ti9O20ceramics powders have been prepared by a sol-gel route. The phase evolution, grain size and dielectric properties of the BaTi4O9and Ba2Ti9O20-based ceramics powders have been investigated. These results show that the BaTi4O9and 5 wt% B2O3-doped Ba2Ti9O20ceramics powders calcined at 800°C for 2 h with the grain sizes of 30-80 and 50-200 nm, respectively. Monophase sample of BaTi4O9with orthorhombic symmetry could be obtained after the BaTi4O9precursor was calcined at 1200°C for 2 h, whereas, monophase sample of 5 wt% B2O3-doped Ba2Ti9O20was obtained at 800°C for 2 h. The BaTi4O9and Ba2Ti9O20: 5 wt% B2O3ceramics fabricated using the sol-gel powders were found to have microwave dielectric properties with εr= 36.1, Q = 3220 at 5.31 GHz, and εr= 34.5, Q = 2425 at 5.53 GHz, respectively. The effect of sintering temperatures on the microwave dielectric properties of the Ba2Ti9O20: 5 wt% B2O3ceramics was studied.
Original languageEnglish
Pages (from-to)119-122
Number of pages4
JournalJournal of Electroceramics
Issue number2
Publication statusPublished - 1 Mar 2005


  • Ba Ti O 2 9 20
  • BaTi O 4 9
  • Ceramics
  • Dielectric properties
  • Microwave materials

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Materials Chemistry
  • Electrical and Electronic Engineering


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