Thermal and dynamic mechanical analyses on Bi0.5Na0.5TiO3-BaTiO3ceramics synthesized with citrate method

Xiu Cheng Zheng, Guangping Zheng, Zheng Lin, Zhi Yuan Jiang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

22 Citations (Scopus)

Abstract

Bi0.5Na0.5TiO3-xBaTiO3(BNT-xBT) nano-powders are successfully synthesized by a modified citrate method. The as-prepared BNT-BT powders and the sintered ceramics are homogeneous with a pure perovskite crystal structure. The effects of Ba2+substitutions for (Bi0.5Na0.5)2+in the A-sites of Bi0.5Na0.5TiO3on its phase transformations are explored. The transformations among ferroelectric (FE), anti-ferroelectric (AFE) and paraelectric (PE) states in these ceramics are characterized using ferroelectric hysteresis tests, modulated differential scanning calorimetry and dynamic mechanical analysis. The FE-AFE transition in BNT-xBT with 0≤x≤0.15 is found to relate with a structural transformation which is a first-order phase transition. The mechanical and thermal analyses provide evidence that AFE state (0≤x≤0.15) could be associated with the incommensurate modulation of rhombohedral structures while the mechanisms of forming AFE state in BNT-xBT (x>0.15) could be different.
Original languageEnglish
Pages (from-to)1233-1240
Number of pages8
JournalCeramics International
Volume39
Issue number2
DOIs
Publication statusPublished - 1 Mar 2013

Keywords

  • Citrate method
  • Elasticity anomaly
  • Lead-free ferroelectric ceramics
  • Phase transformation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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