Abstract
Ultrafine Ba0.5Sr0.5TiO3 powders have been synthesized using citrate precursor method based on low cost starting materials. The effect of calcination temperature and time and citric acid concentration on the crystal structure, the microstructure, the optical and the electrical properties were investigated. XRD, SEM and TEM were used to characterize the crystallization process, the particle size and the morphology of the obtained powders. The results indicated that single — well-crystallized tetragonal Ba0.5Sr0.5TiO3 phase with particle size around 50nm could be obtained after heating at 1000°C for 2h. The tetragonal BST phase was transformed to cubic phase after heating at 1200°C for 2h. The band gap energy and the DC resistivity were increased with increasing the calcination temperature. Such properties nominate them for being a good candidate for use in several potential applications including capacitors, positive temperature coefficient (PTC) resistors, transducers as well as ferroelectric memories.
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