Synthesis of fine-crystalline Ba0.6Sr0.4TiO3-MgO ceramics by novel hybrid processing route

Hong fang Zhang, Siu Wing Or, Helen Lai Wa Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

16 Citations (Scopus)

Abstract

We report the use of a novel powder-in-sol precursor hybrid processing route to synthesize dense, homogeneous, and fine-crystalline Ba0.6Sr0.4TiO3-MgO (BST-MgO) ceramics as well as the study of the sintering behavior, microstructures, and dielectric properties of the ceramics. Nanosized BST powders are dispersed into BST sol-gel precursor and uniformly distributed BST slurry is obtained after ball-milling mixing. Mg(NO3)·6H2O solution is added to the BST slurry to give homogeneous BST-MgO slurry upon ball-milling mixing. The BST-MgO slurry is dried and calcined prior to pressing and sintering at low temperatures of 1200-1300 °C to form the ceramics. The ceramics possess very low dielectric loss tangent below 0.005 for frequency above 1 kHz and for temperature in the range -190-80 °C. The dielectric constant and dielectric tunability increase, while the ferroelectric transition broadening decreases, with increasing average grain size.
Original languageEnglish
Pages (from-to)1218-1222
Number of pages5
JournalJournal of Physics and Chemistry of Solids
Volume70
Issue number8
DOIs
Publication statusPublished - 1 Aug 2009

Keywords

  • A. Ceramics
  • A. Nanostructures
  • D. Dielectric properties
  • D. Microstructure

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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