镝掺杂锆钛酸铅镧透明陶瓷的结构和电光性能

针对锆钛酸铅镧(PLZT)电光陶瓷在光调制器应用中存在工作电压偏高、场致滞后明显等不足,以镧系镝(Dy)元素对锆钛酸铅镧(Pb0.88La0.12)(Zr0.4Ti0.6)0.96O3 [PLZT(12/40/60)]线性电光材料进行掺杂改性.采用热压技术研制镝掺杂锆钛酸铅镧[Pb0.88(La1-xDyx)0.12](Zr0.40Ti0.60)0.96O3](PLDZT)(x=0.1～0.5)透明电光陶瓷.系统考察了PLDZT透明陶瓷的光学性能和电光特性及其与材料结构的相关性.研究表明,Dy掺杂导致材料晶格畸变,微量Dy掺杂有效提高了 PLZT(12/40/60)透明陶瓷的光学透过率,并且使典型的线性电光材料呈现二次电光效应特征,二次电光系数R约为5.59×10-15m2/V2;同时掺杂改性的PLDZT(x=0.1)透明陶瓷的驱动电压较未改性PLZT材料明显降低.     

Growth of Zinc Oxide Thornballs by a Novel Method

Thornballs of zinc oxide (ZnO) is firstly synthesized by a simple solid vapour deposition process under lead oxide (PbO) atmosphere. The micro-thornballs were constituted by numerous needles, which extend outwards in all directions symmetrically. The balls have the dimensions of 120μm in diameter, while the average diameter of the needles was about lO0-200nm. The needles on the balls grow along the (0001) orientation and have gradient cross-sectional radii. Control experiments proved that PbO plays an important role in the growth. The excitationemission measurement exhibits that the synthesized ZnO thornballs possess intensive photoluminescence property, which provides the evidence that PbO does not deteriorate the optical properties of ZnO thornballs.