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Hong Pan,Yuting Hou,Xiaolian Chao,Lingling Wei,Zupei Yang 한국물리학회 2011 Current Applied Physics Vol.11 No.3
La_2O_3-doped Bi_0.5(Na_0.68K_0.22Li_0.1)_0.5TiO_3 lead-free piezoelectric ceramics have been successfully prepared by conventional solid state method and the effects of La_2O_3 doping on microstructure and electrical properties of the ceramics were investigated. The X-ray diffraction patterns demonstrated all ceramics possessed pure perovskite structure with rhombohedral symmetry. The temperature dependence of dielectric constant and dielectric loss revealed two abnormal dielectric peaks of T_d and T_m,which implied that from room temperature to 500 ℃ all ceramics underwent two phase transitions which were from ferroelectric to anti-ferroelectric and anti-ferroelectric to paraelectric, respectively. It was also found that the transition temperature T_d decreased with the addition of La_2O_3. Diffuse phase transition and frequency dispersion of the dielectric constant were observed in all ceramics. Dielectric relaxor behavior obeyed the modified Curie―Weiss law. The results revealed that all samples had relaxor characteristics. In addition, for the ceramics with 0.1 wt.% La_2O_3, optimized electrical properties were obtained, which were as follows: ε_r = 1254 (1 kHz), tan δ = 0.0483, d_33 = 192 pC/N, K_p = 0.27,P_r = 29.1 μC/cm^2, and E_c = 29.0 kV/cm.
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