Ferroelectricity and high tunability in novel strontium and tantalum based layered perovskite materials

Abstract : The present study reveals the ferroelectric nature of the novel (Sr2Ta2O7)100-x(La2Ti2O7)x layered perovskite materials and highlights a large variation of their permittivity under electric fields associated with very low dielectric loss in the radio-frequency range. More precisely, an ideal solid solution has been evidenced within the composition range 0 ≤ x ≤ 5 with lattice parameters and cell volume varying linearly with x. The relative permittivity also depends on the composition and reaches a maximum value (365 @10 kHz, RT), associated with a high tunability (17.6% @0.38 kV/mm) with very low dielectric loss lower than 2.10−3. Variation of the relative permittivity as a function of the temperature is also demonstrated, with the existence of a temperature maximum, increasing with the composition. Polarization-electric field (P-E) measurements feature hysteresis loops for compositions x ≥ 1.85, in conjunction with current peaks in the I-E curves originating from ferroelectric domains switching.
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Florent Marlec, Claire Le Paven, François Cheviré, Laurent Le Gendre, Ratiba Benzerga, et al.. Ferroelectricity and high tunability in novel strontium and tantalum based layered perovskite materials. Journal of the European Ceramic Society, Elsevier, 2018, 38 (6), pp.2526-2533. ⟨10.1016/j.jeurceramsoc.2018.01.033⟩. ⟨hal-01740147⟩

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