Abstract
Barium strontium titanate (BST) with the molar formula (Ba 0.8Sr 0.2TiO 3) has been prepared by two different processing methods: mixed-oxide (BST-MO) and reaction-sintering (BST-RS). X-ray powder diffraction study shows differences in grain size and crystal symmetry for both these ceramics. The former shows a tetragonal symmetry while the latter presents a cubic symmetry. The occurrence of polar micro-regions associated with the higher chemical non-homogeneous distribution of ion defects from the influence of the processing parameters is the main reason for the higher peak dielectric constant ( K m), the higher remanent polarization ( P r), the higher coercive field ( E c), the higher peak current density ( J m), and the lower temperature of peak dielectric constant ( T m) in BST-MO ceramics.
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