The structural and dielectric properties of Ba0.92Sr0.08Ti0.95Sn0.05O3(BSTS)+x(molar ratio, %)Y3+ ceram-ics are investigated. Combining the lattice parameters and the distortion of crystal lattice, an alternation of substitu-tion preference of Y3+ ion for the host cations in perovskite lattice is found. Owing to Y3+ ion entering the A site, the maximum dielectric constant is 5627 for 1.25% Y3+-doped samples; when Y3+ ion is more than 1.25%, it tends to occupy the B site in perovskite lattice, causing a drop in the dielectric constant. Owing to the appearance of oxygen vacancy, the optimized dielectric loss is 0.004 for 1.25% Y3+-doped samples. The thermal stability of BSTS ceram-ics is significantly improved and the Curie temperature shifts to lower value with the amount of Y2O3 increased, making it a superior candidate for capacitor applications.
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