Dielectric properties and relaxation behaviors of Ba doped Sr0.97Sm0.02TiO3 ceramics in different sintering atmospheres

Abstract The Ba x Sr 0.97−x Sm 0.02 TiO 3 (x=0–0.4) ceramics in different sintering atmosphere were prepared by conventional solid-state reaction methods. The effect of different atmosphere on the dielectric properties of Ba x Sr 0.97−x Sm 0.02 TiO 3 ceramics was investigated. The giant permittivity was obtained for Ba x Sr 0.97−x Sm 0.02 TiO 3 ceramics sintered in nitrogen especially for x=0.2, which exhibited a weak temperature- and frequency- dependent giant permittivity (>10 4 ) as well as a low dielectric loss (mostly 4+ ·e - V o . . - e·Ti 4+ ] generated by the fully ionized oxygen vacancies and Ti 3+ ions, while the defect dipoles ( V Sr , , − V o . . ) and interfacial polarization caused the dielectric relaxation of the ceramics sintered in air or O 2 .