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Structure, spectroscopy and dielectric properties of BaTiO3:Eu3+ nanocrystallites prepared by the sol-gel method

Hreniak D., Łukowiak E., Maruszewski K., Pązik R., Stręk W.

Materials Science

2002

Vol. 20, No. 1

43-50

Eu3+-doped BaTiO3 nanocrystalline powders have been obtained by sol-gel method. Their morphology, structure and dielectric properties have been investigated as a function of sintering temperature. The powders sintered at the temperatures below 800 st.C demonstrate luminescence behaviour characteristic of the inversed symmetry Eu3+ sites, where only the 5D0 ??7F1 transitions are allowed. Above this temperature the system undergoes a phase transition characterized by lack of inversion symmetry enabling the dipole-electric transitions.