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Influence of Sr-Substitution on Diffuseness of (Ba1-xSrx)TiO3 Phase Transitions

The results of X-ray diffraction (XRD), scanning electron microscopy (SEM) and dielectric measurements performed for samples of the polycrystalline solid solutions of (Ba1-xSrx)TiO3, are presented. An increase of diffuseness of ferroelectric phase transition and a decrease of the temperature Tm (the temperature of the maximum value of the real part of the electric permittivity; ϵ′) with increase of Sr concentration is observed. Values of the phase angle (approximate to −90°) measured in broad range of temperatures suggest the occurrence of polar regions (clusters) in the temperature range of paraelectric (PE)-ferroelectric (FE) phase transition.