Abstract
This work presents the first systematic study of conductivity characteristics of alkaline earth titanates in the form of polycrystalline and heteroepitaxial thin films as well as nanocrystalline ceramics as a function of temperature (between 600_∘C and 1000_∘C) and continuously adjustable oxygen partial pressures ranging from 10− 20 bar to 1 bar. Compared to the well-known log,σ-log, pO2 profiles of single crystals, the conductivity behavior of CSD-prepared, polycrystalline SrTiO3 thin films with a feature size of about 50 nm differs radically. The most prominent characteristics are a sharp drop under reducing conditions followed by a broad plateau region. Tailored investigations on heteroepitaxial as well as polycrystalline thin films grown by PLD and especially by studies on nanocrystalline BaTiO3 ceramics with a mean grain size of ≤100 nm allowed an unambiguous assignment of the described effects to the nanocrystalline morphology of the samples.
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