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](Zr0.40 Ti0.60)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5.59×10-16 m2/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。

Polycrystalline dysprosium (Dy) doped lanthanum zirconate-titanate (PLZT) ceramics with compositional formula [Pb0.88 (La1-xDyx)0.12][(Zr0.40 Ti0.60)0.96O3] (PLDZT) were prepared by hot-pressed solid-state ceramic method. The influence of Dy3+substitution on phase structure, microstructure, optical property and electro-optical property of the materials was investigated and analyzed. When the doping amount x was 0.1, the optical transmittance of the PLDZT sample reached the maximum value, and the electro-optical effect of the sample transformed from linear effect to quadratic effect. A high quadratic electro-optical coefficient of 5.59×10-16 m2/V2 was examined. To obtain a same variation of di-refractive index Δn, the applied voltage of the PLDZT (x=0.1) sample was decreased obviously.