Applied Physics Letters · 2003 · 144 citations · 13 references
Natural SciencesMaterials EngineeringMaterials ScienceCeramic MaterialsElectronic MaterialsThin FilmsDielectric CeramicsDielectricsFerroelectric CeramicsFerroelectric MaterialsThin Film Electrical PropertiesThin-film MaterialsBarium TitanateCeramic DielectricsCurie-weiss LawDielectric PermittivityElectrical PropertiesPulsed Laser DepositionStrontium Barium TitanateThin-film Dielectrics
Compositionally graded barium strontium titanate [(BaxSr1−x)TiO3—BST, x=0.75, 0.8, 0.9, and 1.0] thin films are fabricated by pulsed-laser deposition on a LaAlO3 substrate with (La0.7Sr0.3)MnO3 as the bottom electrode. A high dielectric permittivity and temperature characteristic without Curie–Weiss law are obtained. A tunability of over 70% is obtained at frequency of 1 MHz, which is higher than that of single BST layer with the same compositions. All the results indicate that the graded thin films have better electrical properties than a single-layer film.
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