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Structural, dielectric, ferroelectric and tuning properties of Pb-free ferroelectric Ba0.9Sr0.1Ti1-xSnxO3

Abstract : A series of Pb-free ferroelectric materials Ba0.9Sr0.1Ti1-xSnxO3 (BSTS-x) with 0 <= x <= 0.15 was successfully prepared via solid-state reaction method. The effect of Sn substitution on the crystal structure, microstructure, dielectric behavior, ferroelectric and tunable features of BSTS-x ceramics were systematically investigated. Room temperature (RT) x-ray diffraction (XRD) analysis using the Rietveld refinement method reveals that all the synthesized BSTS-x ceramics were well crystallized into single perovskite structure. The results show a tetragonal phase for 0.00 <= x <= 0.02, which evolves to orthorhombic and tetragonal coexisting phases for 0.05 <= x <= 0.07. The composition x = 0.10 showed a mixture of tetragonal, orthorhombic and rhombohedral phases at RT, while a single cubic phase is observed for x = 0.15. The crystal phases determined by XRD were confirmed by Raman spectroscopy. Enhanced dielectric permittivity with a maximum value of epsilon'similar to 35000 is observed for x = 0.10 at RT. The ferroelectric behavior of BSTS-x ceramics was investigated through polarization hysteresis loops and tunability measurements. High tunability of 63% at RT and under the low DC-applied electric field of 1.40 kV/cm is achieved for x = 0.10.
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https://hal-u-picardie.archives-ouvertes.fr/hal-03627374
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Soumis le : vendredi 1 avril 2022 - 11:33:32
Dernière modification le : samedi 2 avril 2022 - 03:34:10

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H. Zaitouni, L. Hajji, D. Mezzane, E. Choukri, Y. Gagou, et al.. Structural, dielectric, ferroelectric and tuning properties of Pb-free ferroelectric Ba0.9Sr0.1Ti1-xSnxO3. Ceramics International, 2020, 46 (17), pp.27275-27282. ⟨10.1016/j.ceramint.2020.07.212⟩. ⟨hal-03627374⟩

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