Abstract
The electric permittivity measurements under different ac or dc field amplitudes on lead-free (Na0.5Bi0.5)0.88Ba0.12TiO3 ceramics were performed. A significant increase or decrease in permittivities was observed with increasing ac or dc fields intensity, respectively. It was found that temperature T m decreases or increases with increasing ac or dc fields, respectively. When ac field amplitude increased, stronger frequency relaxation around T m and greater shift in T m was observed. This was in opposite to the effect of dc field intensity. The obtained results were discussed in terms of polar region behaviour in external electric fields.
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