Abstract
Ba0.7Sr0.3Ti0.9925Tm0.01O3 (BST) and core-shell structured BST@BiScO3 ceramics were prepared via a sol-precipitation and conventional sintering method. The single perovskite structure of the BST@BiScO3 ceramic powder and bulk materials were confirmed via X-ray diffraction. Additionally, transmission electron microscopy analysis revealed that the surface of the BST powder was successfully coated in situ with amorphous BiScO3 nanoparticles. Scanning electron microscopy analysis indicated that the grain sizes of the BST@x mol.% BiScO3 (x = 1, 2, 3) ceramics decreased with increasing coating amounts. For x = 4 mol.%, the grain size of the BST@BiScO3 ceramic significantly increased relative to that of BST@x mol.% BiScO3 (x = 1, 2, 3), and some smaller particles were found to have precipitated. The results revealed that the dielectric constants of the BST@BiScO3 ceramics decreased at room temperature, but remained above 10000, and that the dielectric loss was significantly reduced. In addition, the Curie peak of BST@x mol.% BiScO3 (x = 1, 2, 3, 4) broadened and shifted to a higher temperature. The Curie peak of the BST@4 mol.% BiScO3 ceramic material was nearly a flat line. In this work, dielectric materials with high dielectric constants and low dielectric losses were successfully prepared; thus, they met the requirements of miniaturization and temperature stability for dielectric ceramics.
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