Abstract
(Ba0.7Sr0.3)1−x Na x (Ti0.9Sn0.1)1−x Nb x O3 ceramics with compositions x = 0.6, 0.7, 0.8 and 0.9 were synthesized using the solid-state reaction method. These ceramics were examined by X-ray diffraction and dielectric measurements over a broad temperature and frequency ranges. X-ray diffraction patterns revealed a single-perovskite phase crystallized in a cubic structure, for x < 0.8, and in tetragonal, for x ≥ 0.8, with Pm3m and P4mm spaces groups, respectively. Two types of behaviors, classical ferroelectric or relaxor, were observed depending on the x composition. It is noted that temperatures T C (the Curie temperature) or T m (the temperature of maximum permittivity) rise when x increases and the relaxor character grows more significantly when x composition decreases. To analyze the dielectric relaxation degree of relaxor, various models were considered. It was proven that an exponential function could well describe the temperature dependence of the static dielectric constant and relaxation time.
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Ghoudi, H., Chkoundali, S., Aydi, A. et al. Structure and dielectric properties of (Ba0.7Sr0.3)1−x Na x (Ti0.9Sn0.1)1−x Nb x O3 ceramics. Appl. Phys. A 123, 703 (2017). https://doi.org/10.1007/s00339-017-1284-8
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DOI: https://doi.org/10.1007/s00339-017-1284-8