Study on Preparation of BaTiO3 Ceramics Doped with Al3+ by Sol-Gel
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Abstract
BaTi1-xAlxO3 (x=0.02, 0.04, 0.06, 0.08) were prepared by sol-gel methods. The crystal structure, microstructure and dielectric properties were investigated by X-ray diffraction method, scanning electron microscope and Agilent4284A testing analyzer respectively. The results reveal that BaTiO3 is the main phase of the samples and the second phase BaAl2O4 is observed after Al3+ doping. With increasing Al3+ content, the average grain size decreased gradually; the density of samples increased from 5.46 g/cm3 to 5.81 g/cm3, but tended to stable as x≥0.06. What's more, dielectric constant decreased from 4766 to1834, temperature coefficient increased from 0.00132/℃ to 0.0018/℃ and the dielectric peaks broadened at 1MHz. Meanwhile, the stability of defect cluster 2AlTi′ +VO·· was -1.915 eV calculated by General Utility Lattice Program (GULP).
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