Structural and dielectric properties of BaTiO3/SrTiO3-multilayers deposited by PLD

Dielectric superlattices are characterized by the structural variability of the film periodicity additional to the stochiometry. They have interesting dielectric properties different from the solid solutions of the same overa ll composition. In this paper the structural and dielectric properties of BaTiO3 / SrTiO3-s uperlattices prepared by pulsed laser deposition on single crystalline subs trates are characterized in comparison to a (Ba0,5Sr0,5)TiO3 Solid solution . The films were characterized using X-ray diffraction, SEM and dielectric measurements. The BaTiO3 / SrTiO3-superlattices have a different frequency and a weaker b ias and temperature dependence of the dielectric properties than the solid solution. The mechanical stresses caused by the lattice mismatch between th e different layers could be one reason for this behaviour.