Abstract
ABSTRACTWe used the Kramers-Kronig transformation to investigate the local dielectric function of barium titanate, BaTiO3 from regions of sub-micrometer scale. Further the effect of dopants, in this case, Nb, on the dielectric function was investigated to assess the level of its local partitioning in the BaTiO3 lattice. The transmission electron energy loss spectroscopy technique was used to obtain dielectric function by placing a small electron probe in isolated regions of the electron transparent BaTiO3 samples. We observed an anomalous, but consistent, shift in the volume plasmon in all regions of the doped sample (compared to the pure one) indicating a uniform incorporation of the dopant within the lattice.
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