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- Title
Phase transition, ferroelectric and piezoelectric properties of Bi(MgZr)O-modified BiFeO-BaTiO lead-free ceramics.
- Authors
Luo, Lingling; Jiang, Na; Lei, Fengying; Guo, Yongquan; Zheng, Qiaoji; Lin, Dunmin
- Abstract
(0.725 − x)BiFeO-0.275BaTiO-xBi(MgZr)O + 1 mol% MnO lead-free ceramics (x = 0-0.08) were synthesized by a conventional solid state reaction method and the effects of Bi(MgZr)O on phase transition, piezoelectric and ferroelectric properties of the ceramics were investigated. After the addition of Bi(MgZr)O, the crystal structure of the ceramics is transformed from rhombohedral to tetragonal phase and the morphotropic phase boundary (MPB) of rhombohedral and tetragonal phase is formed at x = 0.01. The grain size of the ceramics increases with x increasing from 0 to 0.02 and then decreases with x further increasing. The dielectric peak of the ceramics becomes diffusive with x increasing after the addition of Bi(MgZr)O. The ceramics with x = 0-0.08 exhibit much better electric insulation with the resistivity of 1.0 × 10-5.0 × 10 Ω·cm than pure BiFeO ceramic with the resistivity of ~5 × 10 Ω·cm. Due to the formation of the MPB, the ceramics with x = 0-0.02 possess good densification with the relative densities ρ of 94.9-96.3 %, strong piezoelectricity with the d of 129-135 pC/N and very high Curie temperature with the T of 559-610 °C.
- Subjects
CERAMIC materials; ELECTRIC properties; PHASE transitions; PIEZOELECTRIC ceramics; FERROELECTRIC ceramics; GRAIN size; ELECTRICAL resistivity; ELECTRIC insulators &; insulation research
- Publication
Journal of Materials Science: Materials in Electronics, 2014, Vol 25, Issue 4, p1736
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-014-1792-7