摘要
采用高温固相反应方法制备了高质量的Ba0.95Eu0.05TiO3多晶陶瓷,X-射线衍射谱(XRD)表明所制备的材料为单相,SEM的图象显示材料致密。用波长为514.5 nm激光光源激发,在温度83 K-553 K区间内对Ba0.95Eu0.05TiO3陶瓷进行了系统的拉曼实验研究,实验证明散射强度是温度的函数,在相变点附近散射强度发生突变,同时Eu3+对Ba2+的替代导致了BaTiO3相变温度向低温方向位移。我们并对其物理机理进行了探讨。
The polycrystalline ceramic of Ba0.95 Eu0.05 TiO3 was prepared by the traditional high temperature solid state reaction method. X-ray diffraction （XRD） pattern showed that the sample is single phase, and SEM image displayed that the material is high density. Moreover, the temperature dependence of Raman scattering that was carried out with the 514.5 nm radiation of the argon ion laser for the ceramic has been studied in detail. The Raman spectra revealed that the successive phase transitions taken place as the temperature increases from 83 K to 553 K. The scattering intensity is the function of temperature and it changes abruptly at transition temperature. Phase transition temperatures that relate to BaTiO3 shift to lower temperature as a part of Barium ions are substituted by the trivalent Europium ions. The physical origination of the phase transition temperatures shift has been discussed.
出处
《光散射学报》
北大核心
2009年第1期43-47,共5页
The Journal of Light Scattering
