Abstract
Dielectric properties of Eu0.5Ba0.5TiO3 ceramics were investigated between 10 and 300 K in the frequency range of 1 MHz–100 THz.Permittivity exhibits a strong peak near the ferroelectric phase transition at 215 K. This ismainly due to softening of the lowest frequency polar phonon revealed in THz and infraredspectra. Dielectric relaxation was observed also below the ferroelectric soft mode frequencyin the whole investigated temperature region, but it is probably caused by some defects such asEu3 + cations or oxygen vacancies. This implies that the ferroelectric phase transition haspredominantly a displacive character. Raman scattering spectra revealed a lowering ofcrystal symmetry in the ferroelectric phase and XRD analysis indicated orthorhombicA2mm symmetry below 215 K. The magnetic measurements performed at variousfrequencies in the field cooled and field heating regime after cooling in zero magnetic fieldsexcluded spin glass behavior and proved an antiferromagnetic order below 1.9 K inEu0.5Ba0.5TiO3.
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