Abstract
New ternary lead free CaSnO3–CaTiO3–NaNbO3 (CSNNTx) ferroelectrics were prepared by a solid-state reaction method. The X-ray diffraction patterns at room temperature revealed a single phase perovskite crystallizing with cubic Pm3m group symmetry for x<0.8 and in tetragonal group P4mm for x≥0.8. The real part of the relative dielectric permittivity (ε׳r) exhibited a sharp peak with no frequency dependence which revealed a classical ferroelectric behavior for some compositions and ferroelectric relaxor behavior for others, with a diffuse phase transition and frequency dispersion. The ferroelectric behavior has been confirmed by hysteresis investigation. Raman spectra at room temperature shows a disorder introduced in this composition, thus favoring a ferroelectric relaxor behavior.
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