Abstract
Barium titanate (BaTiO3) is one of the basic materials for electroceramic components and is also used for electrooptic applications. When certain donor dopants such as Nb are introduced, it exhibits the property of positive temperature coefficient of resistance (PTCR) wherein there is a jump in resistance of several orders of magnitude at the transition temperature (∼ 120°C). Although considerable work has been done to understand the influence of dopants on bulk samples, it is not clearly known what the detailed distribution of the dopant is and how it affects local properties.This paper addresses the problem of how the addition of Nb affects local properties of BaTiO3. This is done by using electron energy loss (EEL) spectroscopy which probes the local electronic structure. We use the Kramers-Kronig (KK) analysis to compute the local dielectric function from the low loss electron energy loss data.
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