钛酸锶钡微晶玻璃的铈掺杂效应研究

通过X射线光电子能谱、紫外-可见漫反射光谱、傅里叶变换红外光谱和拉曼光谱研究了(Ba,Sr)TiO3微晶玻璃的铈掺杂效应.玻璃体系为BaO-SrO-TiO2-Al2O3-SiO2(Ce摩尔分数为0％、1％、2％、3％).随着Ce摩尔含量增加,Ce在(Ba,Sr)TiO3晶格中的占位从Ce4+取代Ti4+位的形式逐渐变成...

Cerium Doping Effect in Barium Strontium Titanate Glass-Ceramics

Cerium doping effect in (Ba,Sr)TiO₃ glass-ceramics has been investigated by X-ray photoelectron spectroscopy,ultraviolet-visible diffuse-reflectance spectroscopy,Fourier transform infrared spectroscopy and Raman spectroscopy.Studies were performed on specimens for BaO-SrO-TiO₂-Al₂O₃-SiO₂ glass system (with 0%,1%,2% and 3% mole fraction of cerium).With the change of relative content of Ce³⁺ and Ce⁴⁺,cerium mainly acts as Ce⁴⁺ in the Ti⁴⁺-site of (Ba,Sr)TiO₃ lattice at low content and then cerium substitution gradually occurs in the Ba²⁺/Sr²⁺-site as Ce³⁺ with increasing cerium mole content.The CeO₂ addition in the glass could effectively improve the connectivity of network structure.In (Ba,Sr)TiO₃ glass-ceramics,with the increase of cerium content (0% to 2%),the value of band gap energy decreases,electronic transition energy decreases,then electrons transit from the valence band to the conduction band easily,and the conductivity increases.In contrast,when the mole fraction of cerium increased from 2% to 3%,the value of band gap energy increases,so the conductivity decreases.The results of Raman spectra confirm that cerium ions diffuse into the (Ba,Sr)TiO₃ lattice structure and modify the tetragonality of the barium strontium titanate phase.