Preparation and structure of Ba2Ti9O20 and BaTi4O9 ceramics derived from sol-gel powders

S. G. Lu, Haydn Chen, Chee Leung Mak, K. H. Wong, H. W.L. Chan, C. L. Choy

Research output: Journal article publicationJournal articleAcademic researchpeer-review


Ba2Ti9O20 (B2T9) and BaTi 4O9 (BT4) ceramics have been fabricated using sol-gel technique. The sol-gel derived powder was produced from barium acetate and butyl titanate using acetic acid as solvent. The as-prepared powders were then calcined at different temperatures ranging from 600° to 1200°C. After that, the powder was pressed into pellets and further sintered at different temperatures ranging from 1250°C to 1380°C. XRD characterization and Raman spectroscopy showed that after calcining the sol-gel powder at 900°C for 2 h and sintering the pressed pellets at 1330°C for 4 h, triclinic B2T9 and orthorhombic BT4 ceramics could be obtained, The dielectric constant and Q-value are 35 and 1910 at 6.1 GHz.
Original languageEnglish
Pages (from-to)47-52
Number of pages6
JournalKey Engineering Materials
Issue numberI
Publication statusPublished - 1 Dec 2005


  • Ba Ti O 2 9 20
  • BaTi O 4 9
  • Microwave dielectrics
  • Sol-gel process

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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