Facultatea de Fizică
Universitatea "Al.I.Cuza" Iaşi
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| Titlu: Complex dielectric permittivity of BaTi0.85Zr0.15O3 ceramics prepared by alternative methods |
| Autori: F. C. Dascălu 1 , A. Cârlescu 1 , L. P. Curecheriu 1 , A. Ianculescu 2 and L. Mitoşeriu 1 |
| Afiliere: 1 Department of Physics, “Al. I. Cuza” University, Blv. Carol 11, Iasi, 700506, Romania,
2 Polytechnics University of Bucharest, 17
Gh. Polizu, P.O. Box 12134,
011061 Bucharest,
Romania |
| Abstract: Three different processing routes, i.e. (a) the classical solid state reaction technique, (b) the solprecipitation
method
and (c) the oxalate route were employed for preparing BaTi0.85Zr0.15O3 ferroelectricrelaxor
ceramics. The phase purity
was checked with XRay
diffraction analysis and pure perovskite phase was obtained by all the three methods. The
differences in the microstructures were observed by SEM analysis. The complex dielectric properties of these ceramics
were measured in the frequency range of 20 Hz 2
MHz, at room temperature. The obtained results show that the
dielectric properties of these ceramics, even having the same composition, are highly sensitive to the preparation route.
The preparation method determines important differences of the ceramic microstructures. This results in a certain degree
of local electrical inhomogeneity, thus, causing complicated dielectric relaxation phenomena which are strongly affecting
the dielectric properties of these ceramics. |
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