Ferroelectric Properties of (Bi_<1/2>Pb_<1/2>)(Ni_<1/4>Ti_<3/4>)O_3 for New Piezoelectric Ceramics

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Bismuth lead nickel titanate, (Bi_<1/2>Pb_<1/2>)(Ni_<1/4>Ti_<3/4>)O_3 (BPNT), is studied on the basis of its ferroelectric, piezoelectric and mechanical properties as a new group of piezoelectric ceramics. The crystal phase of BPNT is a tetragonal perovskite type with a large crystalline anisotropy. The Curie temperature, T_c, is 430℃ and the dielectrio constant, ε_s, is 690 at room temperature. The D-E hysteresis loop is observed with a large remanent polarization, P_r=31.4 μC/cm^2, and a large coercive field, E_c=45.4 kV/cm. The electromechanical coupling factors, k_t and k_p, in the thickness and the planar modes are 49% and 31%, respectively. The mechanical strength was slightly higher than that of the conventional PZT system.
社団法人応用物理学会の論文
1993-07-01