稀土掺杂TiO2颗粒的制备及其悬浮液的电流变特性

通过掺杂稀土元素，使TiO2电流变液的屈服强度提高到近5kPa（3kV/mm)。用DSC-TG、IR和XRD等手段对材料的Sol-gel制备过程和产物的晶体结构进行了分析。结果表明纯TiO2和掺杂稀土TiO2凝胶的分解分三阶段完成，并形成锐钛矿结构。掺杂浓度小于一定值时，稀土离子以置换Ti位固溶于TiO2晶格中并引起晶格膨胀。认为适当掺杂所导致的晶格常数变化改善了材料的介电性能，从而使TiO2的电流变性能优化。

Preparation and Electrorheological Characteristics of Rare Earth-Doped TiO2 Suspensions

Doping rare earth ion into TiO2has been found to enhance its electrorheological (ER) effect. The typical yield stress is about 5 kPa at 3 kV/mm DC electric field. The thermal character of xerogel and the crystal structure of produced particles are characterized by DSC, TG, FTIR and XRD techniques. The results show that the xerogels of pure and doped TiO2are calcined to form anatase crystalline. Rare earth ions substitute for Ti and cause striking lattice distortion in the suitable range of rare earth content. We contribute the enhancement of ER effect to the influence of rare earth substitution on dielectric properties of TiO2.