Abstract
Compositionally inhomogeneous Barium Strontium Titanate (BST) ceramics with greatly improved dielectric temperature stability was developed by the combination of the solid-state reaction and mixed-phase method with the help of a sol-assisted sintering technology. It is found that the powders' calcination temperatures have significant effects on the microstructure and the dielectric temperature stability of the sintered BST ceramics. Increasing calcination temperature of either powder slightly degrades the BST ceramics' sintering properties, but can significantly suppress and broaden their Curie peaks. Comparatively, increasing the ST powders' calcination temperature has more obvious effectiveness. When BT and ST powders are calcined at 1100°C and 1200°C, respectively, the sample sintered at 1280°C for 2h has excellent dielectric temperature stability, uniform grain size and relatively dense microstructure (93% R.D).
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