Abstract
The general formula, Sr m−3+x Bi4−x Ti m−x Ta x O3m+3 (m=2 and 3) is a phase relation between well-known bismuth layer-structured ferroelectrics (BLSF) such as Bi4Ti3O12 and SrBi2Ta2O9 including a perovskite compound SrTiO3. The series was discussed to form the layer structure with the numbers m=2 and 3 of layer, where x is the number of Ta ions in the layer structure and 1≦x≦2 for m=2 and 0≦x≦2 for m−3. The Curie temperature, T c' increase as the Sr concentration decreases. From the measurements of D-E hysteresis loops by using a standard Sawyer-Tower circuit, the value of 2P r on Sr0.3Bi3.7Ta2.7Ta0.3O12 (m=3) ceramics was the largest (2P r=24.6 μC/cm2) in above BLSF series.
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