Solid-Solution (Bi_<1-x>Pb_x)(Ni_<(1-x)/2>Ti_<(1+x)/2>)O_3 for New Piezoelectric Ceramics

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A new solid solution, (Bi_<1-x>Pb_x)(Ni_<(1-x)/2>Ti_<(1+x)/2>)O_3 (BPNT-100x)(0.3≤x≤0.5), is studied for their dielectric, ferroelectric, piezoelectric and mechanical properties as a new group of piezoelectric ceramics. The crystal phase of the solid solution is a perovskite structure with x≥0.3. The BPNT-100xr system has a morphotropic phase boundary between a rhombohedral phase and a tetragonal phase at x=0.445. The Curie temperature, T_c, is over 400℃ and the dielectric constant, ε_s, is larger than 600 at room temperature. D-E hysteresis loops are observed with large remanent polarization, P_r≥30 μC/cm^2, and a coercive field, E_c≤45 kV/cm. The electromechanical coupling factors, κ_<33> and κ_<31>, in the longitudinal and the transverse modes are 50.3% and 23.8% at x=0.5 (BPNT-50), respectively. The mechanical strength and hardness were higher than those of the conventional PZT system.
社団法人応用物理学会の論文
1993-09-30