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 language | English |
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Pages (from-to) | 6841-6846 |
Number of pages | 6 |
Journal | Ceramics International |
Volume | 40 |
Issue number | 5 |
DOIs | |
Publication status | Published - 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