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Abstract
Bi 3 − x Nd x TiTaO 9 (B (3−x) N x TT) (0 ≤ x ≤ 0.5) and Bi 2.5 Nd y TiTaO 3 − δ (B 2.5 NyTT) (0 ≤ y ≤ 0.5) ceramics were fabricated by the conventional firing method using Nd(OH) 3 and constituent phase, crystal structure and ferroelectric property was investigated. B (3−x) N x TT had single phase of BLSF (m = 2), however not only BLSF (m = 2) phase but also pyrochlore phase was confirmed for the B 2.5 NyTT. The remanent polarization, P r , value which was 10 μ C/cm 2 with x = 0 decreased down to 6 μ C/cm2 with x = 0.5, and the value of coercive field, E c , which was 100 kV/cm with x = 0 increased up to 163 kV/cm with x = 0.5. Squareness of hysteresis loops was almost the same in the B (3−x) N x TT. On the other hand, in the case of B 2.5 NyTT, the P r value which was 6 μ C/cm2 with y = 0.5 increased up to 13 μ C/cm2 with y = 0.35 though pyrochlore content increased. Furthermore, the squareness of the hysteresis loops with y = 0.35 was better than that of hysteresis loops with y = 0.5. The E c value was the almost the same.