摘要
It is found that doping of cerium ion into anatase TiO_(2)can improve the electrorheological(ER)effects of TiO_(2)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 TiO_(2)ER fluid.Also,the typical Ce-doped TiO_(2)ER fluid shows the highest shear stress at 80℃,but 40℃for pure TiO_(2)ER fluid.The dielectric loss and dielectric constant at low frequency of TiO_(2)is improved by the doping of cerium,and the temperature dependence of the dielectric properties shows an obvious difference between pure and doped TiO_(2)ER fluid.These can well explain the ER behaviour of doped TiO_(2).Furthermore,the change of rheological and dielectric properties is discussed on the basis of the lattice distortion and defects in TiO_(2)arising from the doping of cerium.
作者
YIN Jian-Bo
ZHAO Xiao-Peng
尹剑波;赵晓鹏(Institute of Electrorheological Technology,Department of Applied Physics,Northwestern Polytechnical University,Xi’an 710072;International Center for Materials Physics,Shenyang 110015)
基金
Supported by the National Natural Science Foundation of China under Grant No.59832090
the National Natural Science Foundation of China for Distinguished Young Scholars under Grant No.50025207.