The Influence of DC Bias on the Dielectric Response of Sr1-xCaxTiO3 Ceramics
The effect of the electric field on the dielectric response of the Sr1-xCaxTiO3 ceramic system was analysed and complemented by structural and microstructural studies. A monotonic decrease of the lattice parameter and an increase of the average grain size from 11 to 23 μm with increasing x were observed by X-ray diffraction and scanning electron microscopy analysis respectively. Samples with x = 0.003 and 0.01 reveal a monotonous increase of low-temperature dielectric constant, corresponding to an enhancement of the tunability and a reduction of the driving electric field at 10-30 K for x = 0.01. For Sr1-xCaxTiO3 ceramic samples with x = 0.04 and 0.10 the ferroelectric phase transition of around 20 K was observed together with the enhanced tunability of the dielectric constant at 30-85 K for x = 0.10.
Paula Maria Vilarinho
A. Tkach et al., " The Influence of DC Bias on the Dielectric Response of Sr1-xCaxTiO3 Ceramics", Materials Science Forum, Vols. 514-516, pp. 240-244, 2006