Resistance degradation behavior of Ba0.7Sr0.3TiO3 thin films compared to mechanisms found in titanate ceramics and single crystals

Abstract
The resistance degradation behavior of Ba0.7Sr0.3TiO3 (BST) and SrTiO3 (ST) thin films is compared to the degradation behavior of titanate single crystals and ceramics with respect to the dependence on parameters such as temperature, thickness of the sample, applied voltage, acceptor dopant concentration and electrode material. Different model considerations to explain the resistance degradation in titanate thin films are discussed.