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The electronic structures of ABO3 ferroelectrics are calculated within thedensity functional theory, and their evolution is analyzed as the crystal-fieldsymmetry changes from cubic to rhombohedral via tetragonal phases. Electronicstructure fingerprints that characterize each phase from their electronicspectra are identified. We carried out electron-energy loss spectroscopyexperiments by using synchrotron radiation and compared these results to thetheoretical spectra calculated within DFT-LDA. The dominant role of the BO6octahedra in the formation of the energy spectra of ABO3 compounds wasdemonstrated. Anomalous behavior of plasmons in ferroelectrics was exhibited bythe function representing the characteristic energy loss in the region of phasetransition.

Electron Energy-Loss Spectroscopy and the Electronic Structure of ABO3 Ferroelectrics: First Principle Calculations