Preparation And Characterization Of Lead-free Ferroelectric Ceramics Doped With Boron Group Elements

Ferroelectric ceramics has extensive applications in the electronics technology, laser technology, ultrasound technology, infrared detection technology. They are an important kind of hi-tech materials with fierce international competition. However, the traditional ferroelectric ceramics mostly contain lead in which lead oxide (or lead tetroxide) is about 70 percent of the total mass of raw materials. Lead-free ferroelectric ceramics will harm both the environment and human beings in terms of preparation or use. Therefore, with great practical significance, the development of the environment for the coordination of non-lead ferroelectric ceramics is an urgent subject. Scientifics in Japan, France, Russia, China and South Korea are stepping up the study of non-lead based ferroelectric.In this paper, solid-phase synthesis of ceramics in high-temperature is selected. Choose the BT and BST system because of its wide use. Then study the effect of doping concentration, sintering temperature on the dielectric properties of ceramics doped with Boron group elements with the variety of the radii of doping ions. Use the Dielectric tests, X-ray diffraction, Scanning electron microscopy, Infrared absorption spectroscopy, UV-visible spectroscopy and other analytical tools, a systematic study of lead-free ferroelectric ceramics doped with Boron group elements is discussed on the material structure and functions, and the mechanism of doping is explored.The variety of spectral analysis showed that there is an important effect on the dielectric properties of ferroelectrical ceramics with the variety of the radii of doping ions, doping concentration, sintering temperature. Dielectric properties of ferroelectrical ceramics varying with the difference of ionic radii, doping concentration and sintering temperature show a regular changes.