Preparation And Modification Of Zirconium Titanate Titanate Ceramics

Dielectric ceramics are the most important materials in the research of electronic components.They are widely studied due to their advantages of corrosion resistance,high temperature resistance,ease of manufacture and low price.Electronic ceramic materials containing lead for a long time have excellent dielectric,ferroelectric and piezoelectric occupies.However,the use of lead-containing materials is bound to bring irreversible damage to the environment,so countries around the world have increased supervision and control of lead-containing devices.China has long adhered to the development concept of“Green Water Qingshan is Jinshan Yinshan”.Pursuing green,environmental protection and energy conservation is also the direction of science and technology development in China and even the world.Therefore,the development and application of lead-free devices is particularly important,and the barium titanate material,which is known as the"pillar of the electronic ceramic industry",has become a hot research focus.In this study,BaTiO₃ ceramics doped with Zr⁴⁺ions were prepared by traditional solid-state reaction method.The effect of Zr⁴⁺ions on the physical properties of BaTiO₃ceramics was studied by the content of Zr⁴⁺ions in BaTiO₃ ceramics.In addition,in the solid phase reaction process,it is necessary to provide an ultra-high temperature environment.The ultra-high temperature environment is bound to cause huge energy waste.Excessive sintering temperature will also make ceramic samples have high dielectric,ferroelectric and piezoelectric properties.The reduced amplitude is not conducive to the performance of the material should be excellent.At the end of the study,the optimized ceramic materials were modified.The modified ceramic materials further enhanced the application value of BZT ceramics in the electronic ceramics industry.The following conclusions were drawn:1)BaTiO₃ ceramic doped with Zr⁴⁺ions,namely Ba(Zr_xTi_1-x)O₃（BZT）,is prepared by a conventional solid phase reaction method.The concentration of Zr⁴⁺ions in BaTiO₃ ceramics was controlled（0⁵0%）.The effects of Zr⁴⁺ion content on the physical properties of BZT ceramics such as crystal structure,appearance,density,dielectric properties and ferroelectricity were investigated.The results show that the dielectric constant reaches the maximum when the Zr⁴⁺ion content increases to 15%,and then decreases with the increase of Zr⁴⁺ion content.The Curie temperature decreases with the increase of Zr⁴⁺ion content.When the Zr⁴⁺ion content is 20%,the Curie temperature is close to room temperature.2)Ba(Zr_0.2Ti_0.8)O₃ ceramics were prepared by traditional solid phase reaction method to control the sintering temperature in the preparation process of ceramics,and to find the optimum sintering temperature of BZT ceramics.When the sintering temperature reaches1305°C,the crystallinity and density of the sample preferably reach a maximum dielectric constant.3)Adjust the sintering process parameters of Ba(Zr_0.2Ti_0.8)O₃ ceramics in the solid phase reaction method and change the grain size of BZT ceramics.The effect of grain size on dielectric properties was investigated by changes in grain size.When the grain size is 5μm,the crystallinity,density and dielectric properties are optimal,and the dielectric properties continue to decrease as the grain size continues to decrease.4)MgO is used as a modifier for Ba(Zr_1.5Ti_0.85)O₃ ceramics,and is micro-doped modified for BZT ceramics.The effect of MgO on the physical properties of BZT was studied by studying the doping content of MgO in BZT ceramics.The micro-MgO doping reduces the sintering temperature and improves the dielectric properties.When the MgO doping amount is0.25 mol%,the Curie temperature is lowered from around 75°C to room temperature.