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Improved dielectric and ferroelectric properties of high Curie temperature (1-x)BiFeO3–xPbTiO3 ceramics by aliovalent ionic substitution.
- Source :
-
Applied Physics Letters . 12/4/2006, Vol. 89 Issue 23, p232904. 3p. 3 Graphs. - Publication Year :
- 2006
-
Abstract
- Ceramics of 0.67Bi(Fe1-xTix)O3+x/2–0.33PbTiO3 (x=0, 0.005, 0.01, 0.02, 0.04) were prepared by solid state reactions, with a relative density of 94%–97%. The dielectric and ferroelectric properties of the ceramics have been significantly improved by means of aliovalent ionic substitution of Ti4+ for Fe3+, which reduces the electric conductivity. The temperature variation of the dielectric constant has been measured up to the Curie temperature as high as TC=650 °C. A saturated dielectric hysteresis loop with a remnant polarization (Pr) of 9 μC/cm2 is displayed in the 0.5 mol % Ti4+-substituted sample at room temperature. Pr reaches 17 μC/cm2 in the sample with 2 mol % Ti4+ even though the hysteresis loop is not saturated, suggesting that a much higher saturated polarization can be expected in the Ti4+-substituted BiFeO3–PbTiO3 ceramics. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 89
- Issue :
- 23
- Database :
- Academic Search Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 23489785
- Full Text :
- https://doi.org/10.1063/1.2397560