Abstract
The mass and charge transport properties as well as structure and composition of grain boundaries in interfacially controlled electroceramic materials are reviewed. Recent advances in the field of donor doped (n-conducting) barium titanate are emphasized, comprising experimental methods such as the characterization of the structure and composition of grain boundaries, the experimental determination of the electrical properties as a function of temperature, oxygen partial pressure and dc bias, the investigation of diffusion along grain boundaries involving conductivity relaxation experiments and 18O - tracer exchange measurements. In addition, phenomenological modeling of transport properties of grain boundaries in donor doped BaTiO3 are outlined in detail, encompassing finite element simulations of diffusion processes as well as modified Schottky barrier models which are suitable for the calculation of the electrical properties as a function of temperature and dc bias.
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