Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9808752 | Materials Letters | 2005 | 7 Pages |
Abstract
Solid solutions of the Aurivillius-type compounds with Bi4âxBaxTi3âxNbxO12 formula were prepared by solid-state reaction of the constitutive oxides at optimised temperatures. The room temperature structural data were obtained from X-ray diffraction (XRD). The solubility limit of (Ba, Nb) was estimated to x=1.4. The dielectric properties of sintered ceramics were investigated in wide temperature (25-800 °C) and frequency (1 kHz-1 MHz) ranges. For low substitution rates (0â¤xâ¤0.4) the compounds behave as normal ferroelectrics with Curie temperature decreasing with increasing x. For xâ¥0.6, the materials exhibit a ferroelectric relaxor-type behaviour which was correlated to the relaxation of polar clusters induced by the heterovalent substitution on Bi and Ti sites.
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Authors
D. Ben Jennet, P. Marchet, M. El Maaoui, J.P. Mercurio,