Ferroelectric losses in BaTiO3produced the 90° domain walls

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Abstract
We report an analysis of dielectric losses in very pure BaTiO3 ceramics between 100 Hz and 10 Mhz, which have their origin in the vibrations of the 90° domain walls. The experimental results can be described by the superposition of 4 relaxations, which probably correspond to the four usual configurations of the 90° domains, as proposed by Fousek and Brezina. The maxima are located at 170, 1.4 × 103, 1.7 × 104,1.3 × 10s Hz at 50°C and at 45, 104, 4.6 × 104, 4 × 10s Hz at 130°C (2°C below the Curie point). The maximum values are also temperature dependent. We note that the temperature variation of the characteristic frequencies are stronger in the interval 110–130°C than between 50 and 110°C.