The Effect Of Nb Element On The Microstructure And Piezoelectric Properties Of 0.47BCT-0.53BZT Ceramic Material

Ferroelectric material is a kind of very important functional materials. In the past few decades, PZT and many other lead-based materials lead the development and application of piezoelectric. However, when prepared with high temperature, the lead elements volatilize can bring serious harm to the environment, which is a huge threat. Thus, it has become a new research direction for us to prepare lead-free material with high piezoelectric properties, economically and significantly. Barium titan ate?BaTiO₃? lead-free piezoelectric ceramic material is a kind of material with high dielectric constant, low dielectric loss, large piezoelectric coefficient, good ferroelectric property and excellent insulation performance. However, compared with lead based materials, the stability of BaTiO₃ material of dielectric constant is not so good. And the piezoelectric variable of BaTiO₃ material is smaller than lead based material. What's more? The BaTiO₃ material has a smaller residual polarization. That is to say, BaTiO₃ ceramic can not directly be a replacement of lead-based ceramics.Thus, we add a group of more groups of element to improve its properties in order to replace lead-based ceramics. BCT-BZT is a material which is co-doped with Ca²⁺and Zr⁴⁺ to become a kind of composite BaTiO₃. BCT-BZT ceramic material shows enhanced performance than pure BaTiO₃ material.In our present work, we has prepared a series of [x(Ba_0.7Ca_0.3)TiO₃-?1-x?Ba(Zr_0.2Ti_0.8)O₃]?xBCT-?1-x?BZT??x=0.47?0.50?0.53?0.56?lead-free ceramics by traditional solid-state reaction method to optimize the performance of BaTiO₃ ceramic. First of all, the paper studies the effect of composition on the dielectr ic constant of xBCT-?1-x?BZT ceramic. The result shows that the room temper ature dielectric constant reach a maximum value when x=0.47. Secondly, the a rticle explores the influence of composition on the piezoelectric property. Theresults indicates that the piezoelectric variable has reached the maximum with x=0.47. Finally, this paper studies the effect of component on the remaining polarization. The results make it clear that the remnant polarization reaches maximum when x=0.47.But this kind of ceramic material with such properties is not able to replace lead-based materials. As is shown in the above experiment, 0.47BCT-0.53 BZT ceramic material has better performance. Therefore, we choose the 0.47 BCT-0.53 BZT ceramic as the matrix material and Nb₂O₅ as the doped material. 0.47(Ba_0.7Ca_0.3)TiO₃-0.53Ba(Zr_0.2Ti_0.8)O₃-tmol% Nb₂O₅ ceramic material have been prepared by traditional solid reaction method and t=0, 0.2, 0.3 0.5 and 1.0. First of all, the paper studies the effect of doping ratio on the remaining polari zation of 0.47BCT-0.53BZT ceramic. The result shows that the remnant polari zation reach a maximum value when t=0.3. Secondly, the article explores the influence of doping ratio on the piezoelectric property. The results indicates th at the piezoelectric variable has reached the maximum with t=0.3. Finally, this paper studies the effect of doping ratio on the ceramic structure. The results make it clear that the crystal grain reaches the maximum when t=0.3.