Structural characteristics and optical properties of lead-free Bi(Zn1/2Ti1/2)O3-BaTiO3 ceramics
Structural characteristics and optical properties of lead-free Bi(Zn1/2Ti1/2)O3-BaTiO3 ceramics
复制标题
DOI：
10.1016/j.ceramint.2017.02.014
复制
发表时间：
2017-06
影响因子：
5.2
通讯作者：
Lu Yu;H. Deng;Wenliang Zhou;P. Yang;J. Chu
中科院分区：
文献类型：
--
作者：
Lu Yu;H. Deng;Wenliang Zhou;P. Yang;J. Chu
采用固相反应法制备了x（mol）=0，0.03，0.06，0.09和0.12的xBi（Zn_（1/2）Ti_（1/2））O_3-BaTiO_3（xBZT-BT）陶瓷。研究了薄膜的相变、显微结构和光学性能。X射线衍射分析表明，样品为多晶钙钛矿结构。当x <0.06时，BZT-BT陶瓷呈现明显的四方对称性，当x≤0.12时，BZT-BT陶瓷转变为三方相。当x =0.06时，四方相和菱方相共存。晶格应变的Williamson-Hall分析模型估计，这表明，纳入到主机晶格的替代离子产生的内部应力场引起的结构畸变。拉曼散射光谱证实了四方性随x的增加而降低，其中声子模的特征变化间接揭示了Bi（Zn 1/2 Ti 1/2）O3的掺入。此外，xBZT-BT陶瓷的光学带隙呈现非线性变化，这可以用晶场理论和相结构效应来解释。
ThexBi(Zn1/2Ti1/2)O3-BaTiO3(xBZT-BT) ceramics, wherex(mol) =0, 0.03, 0.06, 0.09, and 0.12, have been prepared by a solid-state reaction method. The phase transition, microstructure and optical properties were investigated. X-ray diffraction patterns indicate that the as-prepared samples have a polycrystalline perovskite structure. Forx<0.06, thexBZT-BT ceramics exhibit clear tetragonal symmetry, and transform to rhombohedral phase as 0.06<x≤0.12. Coexistence of both tetragonal phase and rhombohedral phase is observed forx=0.06. The lattice strain is estimated by the Williamson-Hall analysis model, which suggests that the incorporation of substitution ions into the host lattice produces the inner stress field gives rise to structure distortions. The Raman scattering spectra corroborate the decrease in tetragonality with increasing thex, where the characteristic variation of phonon modes indirectly reveal the incorporation of Bi(Zn1/2Ti1/2)O3. Furthermore, the optical band gaps ofxBZT-BT ceramics show a non-linear change, which can be explained by the crystal field theory and phase structure effect.