Luminescence And Dielectric Properties Of Rare Earth Doped Barium Titanate Material

Barium Titanate ceramics materials, which have the structure of oxygen octahedron, are the representative ferroelectric crystal. Because of their simple structure, high dielectric properties, typical ferroelectric as well as the strong piezoelectric effect, as a typical one of the ferroelectric crystals studies, they obtained extensive research; And also on the process research, such as doped with other material constitutes a solid solution material to prepare more valuable new ceramics. Even now, the use of Barium Titan ate semiconductor ceramic PTC thermostat characteristics of manufacturing and radiation heat areas such as measuring element still has a broad application prospects.In this work, a typical ferroelectric material, BaTiO3 is selected because of its simple perovskite structure. Rare-earth ions (Choose several representative ions doping) doped barium Titanate ceramics are prepared by Sol-Gel method. We have investigated the effect of substitution on A sites on the structure and properties by the analysis of X-ray diffraction, UV - visible spectroscopy and scanning electron microscope. The mechanisms among them have been also tentatively discussed. So as to explore the impact of their physical properties with the micro-structural changes, to establish cause-doped Barium Titanate structure change and its impact on performance relationship.In addition, the influence of element substitution on aging effect of Barium Titanate ceramics has been investigated. We discussed the influence on doping and Ti-O octahedrons aberration as well as Curie temperature, aging effect by spectra test and the measure of ferroelectric properties and time stability. It was found that the fluorescence spectroscopy and UV-Vis spectra both have corresponding disciplinary change along with the change of doping concentration and the different aging time. The polarization effect and oxidation ability of doping ions both produce an effect on the position of absorption edges in UV-Vis spectra. Meantime, through the fluorescence spectra of rare earth ions doped study, we found that the lattice structure changed. It means that the crystal-field change is one of the important factors for the luminescence of rare earth ions.