LAUSR

Abstract The lead free perovskite ferroelectric nano-powder (Ba1-xSrx)TiO3 (x = 0.0, 0.025, 0.05, 0.075 and 0.1) have been synthesized by using Sol-gel method. The main issue of measurement the UV-optical properties of the ceramics can be shortened into the solubility of the powder inside a suitable solution. The present study reports an overview for how to solve this problem and the technique has been illustrated in-details in the experimental section. The crystalline and the microstructure of the investigated samples were observed employing X-ray diffraction (XRD) and scanning electron microscope (SEM) equipped with an energy-dispersive X-ray (EDAX) analyzer respectively. The thermal analysis of the pure calcined powder was performed by using differential thermal analysis (DTA). The single phase powder and ceramics were detected by using XRD, where the phase obtained by calcined and sintered the samples at 1000 and 1200 °C for 3 h respectively. The patterns were observed matched with BaTiO3 perovskite tetragonal structure with absence of any detectable for the secondary phases. The particle size of the ceramics was observed decreased with increasing the concentration of Sr ions owing to the different ionic radius between Ba2+ (1.36 A) and Sr2+ (1.19 A). The characterization of the electrical properties for the sintered pellets within the temperature range (30–270 °C) were performed by dielectric spectroscopy method. The temperature and frequency dependences of dielectric permittivity (ԑr) and diffused phase transition (DPT) showed the changes in the character of the ferroelectric-paraelectric (FE–PE) phase transition.