论文标题
无PB铁电BA0.9SR0.1TI1-XSNXO3的结构，介电和调谐特性
Structural, dielectric, ferroelectric and tuning properties of Pb-free ferroelectric Ba0.9Sr0.1Ti1-xSnxO3
论文作者
论文摘要
通过固态反应方法成功制备了一系列无PB铁电材料BA0.9SR0.1TI1-XSNXO3（BSTS-X），具有0 <x <0.15。 SN取代对BSTS-X陶瓷的晶体结构，微结构，介电行为，铁电和可调特征的影响。室温（RT）X射线衍射（XRD）分析使用Rietveld改进方法表明，所有合成的BSTS-X陶瓷都很好地结晶成单个钙钛矿结构。结果显示了0.00 <x <0.02的四方相，该相变为正晶和四方共存阶段，为0.05 <x <0.07。组成X = 0.10显示在RT处的四方，正骨和菱形相位的混合物，而观察到X = 0.15的单一立方相。通过XRD确定的晶体通过拉曼光谱证实。在RT时，观察到x = 0.10的增强的介电介电常数，最大值为ε'〜35000。通过极化磁滞回路和可调性测量研究了BSTS-X陶瓷的铁电行为。在RT和DC低的电场下，高可调性为1.40 kV/cm的高可调性，x = 0.10。
A series of Pb-free ferroelectric materials Ba0.9Sr0.1Ti1-xSnxO3 (BSTS-x) with 0 < x < 0.15 was successfully prepared via solid-state reaction method. The effect of Sn substitution on the crystal structure, microstructure, dielectric behavior, ferroelectric and tunable features of BSTS-x ceramics were systematically investigated. Room temperature (RT) x-ray diffraction (XRD) analysis using the Rietveld refinement method reveals that all the synthesized BSTS-x ceramics were well crystallized into single perovskite structure. The results show a tetragonal phase for 0.00 < x < 0.02, which evolves to orthorhombic and tetragonal coexisting phases for 0.05 < x < 0.07. The composition x = 0.10 showed a mixture of tetragonal, orthorhombic and rhombohedral phases at RT, while a single cubic phase is observed for x = 0.15. The crystal phases determined by XRD were confirmed by Raman spectroscopy. Enhanced dielectric permittivity with a maximum value of ε'~ 35000 is observed for x = 0.10 at RT. The ferroelectric behavior of BSTS-x ceramics was investigated through polarization hysteresis loops and tunability measurements. High tunability of 63% at RT and under the low DC-applied electric field of 1.40 kV/cm is achieved for x = 0.10.
