Optical Properties (VUV Region) of ABO₃ Ferroelectrics: Application of Syncrotron Radiation

Abstract

The method of vacuum ultraviolet (VUV) spectroscopy were used to study the optical properties of ABO₃ ferroelectrics (LiNbO₃, LiTaO₃, Ba_xSr_1-xNb₂O₆, Ba₂NaNb₅O₁₅, SrTiO₃, BaTiO₃, PbMg_1/3Nb_2/3O₃, KTaO₃, KNbO₃) in the photon range from 1.0 eV to 35.0 eV at temperatures T=10–600 K. The results were used to calculate the optical functions, density of states and energy spectra of these compounds. A comparison of the experimental results with theoretical calculations shows the fundamental significance of the BO₆ octahedron in the formation of the energy spectra of ABO₃ ferroelectrics.

Keywords:

• ABO₃ ferroelectrics
• VUV spectroscopy
• BO₆-octahedron

Notes

^a Ba_0.35Sr_0.65Nb₂O₆

^b Ba₂NaNb₅O₁₅

^c PbMg_1/3Nb_2/3O₃.