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The temperature and frequency dependence of dielectric properties of A-site lower valence cation Na-doped Barium strontium titanate (Ba 1−x Na x ) 0.9 Sr 0.1 TiO 3−δ (x=0.01, 0.03, 0.05, 0.08, 0.1, 0.15, 0.2 and 0.3) ceramics have been investigated up to 450°C from 100Hz to 1MHz. Other than dielectric properties at low temperature, the relaxation behavior above...
The aging properties of 0.01mol% Mn-doped Ba 0.8 Sr 0.2 TiO 3 ceramics have been investigated from 30°C to 400°C at various frequencies. Decreases in ε′(T) of the aged sample compared to the fresh one around the tetragonal–cubic transition and in the regime of diffusion have been observed. The activation energy E a =1.25eV obtained from the J–T loop at zero electric...
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