Effects of ball milling on microstructure and electrical properties of sol-gel derived (Bi0.5Na0.5)0.94Ba0.06TiO3 piezoelectric ceramics

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Hongqiang Wang
  • Ruzhong Zuo
  • Xun Ji
  • Zhengkui Xu

Detail(s)

Original languageEnglish
Pages (from-to)4403-4407
Journal / PublicationMaterials and Design
Volume31
Issue number9
Publication statusPublished - Oct 2010

Abstract

A citrate sol-gel method was investigated for synthesizing lead-free piezoelectric compositions of (Bi0.5Na0.5)0.94Ba0.06TiO3 (BNT) and the effect of ball milling on the sintering, microstructure and electrical properties of BNT ceramics was emphasized. The thermal analysis and X-ray diffraction results show that crystalline powders with a single perovskite structure can be obtained when calcined at 600°C for 3h. The average particle size of as-calcined powder and electrical properties of sintered samples were obviously dependent on an additional ball milling. Because of well-dispersed superfine powders (∼100nm), the BNT ceramics can be well densified at temperature 50°C lower than that by mixed-oxide method and conventional sol-gel method and as a result exhibit enhanced electrical properties of a piezoelectric constant d33∼180pC/N and a planar electromechanical coupling factor kp∼0.29. © 2010 Elsevier Ltd.

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