1Institute of Electrorheological Technology, Department of Applied Physics, Northwestern Polytechnical University, Xi’an 710072
2International Center for Materials Physics, Shenyang 110015
Electrorheological Effects of Cerium-Doped TiO2
YIN Jian-Bo1;ZHAO Xiao-Peng1,2
1Institute of Electrorheological Technology, Department of Applied Physics, Northwestern Polytechnical University, Xi’an 710072
2International Center for Materials Physics, Shenyang 110015
Abstract： It is found that doping of cerium ion into anatase TiO2 can improve the electrorheological (ER) effects of TiO2 and broaden operational temperature range. Especially, substitution of 7-11mol% of the cerium dopant for Ti can obtain a relatively high shear stress, τ = 7.4kPa (at 4kV/mm), which is ten times larger than that of pure TiO2 ER fluid. Also, the typical Ce-doped TiO2 ER fluid shows the highest shear stress at 80°C, but 40°C for pure TiO2 ER fluid. The dielectric loss and dielectric constant at low frequency of TiO2 is improved by the doping of cerium, and the temperature dependence of the dielectric properties shows an obvious difference between pure and doped TiO2 ER fluid. These can well explain the ER behaviour of doped TiO2. Furthermore, the change of rheological and dielectric properties is discussed on the basis of the lattice distortion and defects in TiO2 arising from the doping of cerium.
2001, Vol. 18 
