Preparation and electrorheological property of Y4O(OH)(9)(NO3)-NH4NO3 materials

作者：Ma SZ; Huo L; Jia YL; Shang YL; Li SX; Xu MY; Li JR^*; Zhang SH

来源：Journal of Rare Earths, 2006, 24(2): 168-171.

DOI：10.1016/S1002-0721(06)60087-2

• electrorheological property
• Y4O(OH)(9)(NO3)-(NH4NO3) material
• dielectric and conductive property
• rare earths

The new electrorheologicall (ER) material, a particle material composed Of Y4O(OH)(9)(NO3) and NH4NO3, was obtained. They display better ER performance. The shear stress of the suspension Of Y4O(OH)(9)(NO3) (NH4NO3)(2.8) material in dimethyl silicone oil reaches 1469 Pa at an electric field strength (E) of 4.2 kV (.) mm(-1) and the shear rate (gamma) of 150 s(-1) The relative shear stress, tau((E)/tau(0)(tau(E) and tau(0) are the shear stresses at E = 4.2 and 0 kV (.) mm(-1), respectively), is up to 29, which is 19 times that of pure Y2O3 material. The dielectric and conductive property of the materials play important roles in the modification of the ER effect of the particle materials. The researches on these new ER materials are very useful for obtaining a better understanding on the mechanism of the ER effect and finding an ideal ER material.

• 出版日期2006-4
• 单位北京大学; 北京理工大学; 南宁师范大学; 河北师范大学