Abstract
Lead-free Ba1−xLax(Ti0.98Zr0.02)O3 with x = 0.00, 0.02, 0.04, 0.06 ceramics were prepared by solid state reaction method. The nomenclatures for the compositions are: BLZT-00, BLZT-02, BLZT-04 and BLZT-06 for x = 0.00, 0.02, 0.04, 0.06, respectively. The powders were calcined at 1000 °C for 4 h and sintered at 1400 °C for 2 h. X-ray diffraction patterns of sintered pellets confirm pure perovskite phase. The samples after sintering were leveled, electrode and characterized for dielectric constant at different temperatures, hysteresis loop, etc. The maxima of dielectric constant peak shifted to lower temperature with the increase in La2O3 concentration which indicates the decrease in Curie temperature (Tc). The Tc values are 375 °K, 355 °K, 325 °K and 250 °K for BLZT-00, BLZT-02, BLZT-04 and BLZT-06, respectively. Ferroelectric loop measurement showed the remnant polarization decreased with the increase in La2O3 concentration.
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