Structure, dielectric and piezoelectric properties of Ba0.90Ca0.10Ti1-xSnxO3lead-free ceramics

Dunmin Lin, Kin Wing Kwok, H. L.W. Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)

Abstract

Lead-free piezoelectric ceramics Ba0.90Ca0.10Ti1-xSnxO3have been prepared by a conventional ceramic fabrication technique and the effects of Sn4+on the structure, dielectric and piezoelectric properties of the ceramics have been investigated. All the ceramics exhibit a pure perovskite structure. After the substitution of Sn4+, the crystal structure of ceramics is transformed gradually from a tetragonal to an orthorhombic phase, and becomes a pseudo-cubic phase at x≥0.14. The substitution also decreases the Curie temperature greatly from 138 C at x=0 to 33 C at x=0.12, and shifts the orthorhombic-tetragonal phase transition to higher temperatures. Coexistence of the orthorhombic and tetragonal phases is formed in the ceramic at x=0.10, leading to significant improvements in the piezoelectric properties: d33=521 pC/N and kp=45.5%. Our results also reveal that the ceramics sintered at higher temperatures contain larger grains, and thus exhibit more noticeable tetragonal-orthorhombic phase transition and enhanced ferroelectric and piezoelectric properties.
Original languageEnglish
Pages (from-to)6841-6846
Number of pages6
JournalCeramics International
Volume40
Issue number5
DOIs
Publication statusPublished - 1 Jun 2014

Keywords

  • BaTiO -based 3
  • Dielectric property
  • Piezoelectricity
  • Sn-substitution

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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