Preparation and Electrorheological Property of Y_4O(OH)_9(NO_3)-NH_4NO_3 Materials  

作　　者：马淑珍 霍莉 贾云玲 商艳丽 李淑新 许明远 李俊然 张少华 

机构地区：[1]State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China [2]Department of Chemistry, Baoding Teacher's College, Baoding 071051, China [3]Department of Chemistry, Hebei Normal University, Shijiazhuang 050091, China [4]School

出　　处：《Journal of Rare Earths》2006年第2期168-171,共4页稀土学报（英文版）

基　　金：ProjectsupportedbytheStateKeyLaboratoryofVehicleTransmission(51457030103JW0201);theNationalNaturalScienceFoundationofChina(20023005;29831010)andtheNationalKeyProjectforFundamentalResearch(G1998061305)

摘　　要：The new electrorheologicai （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 （7） of 150 s^-1 The relative shear stress, τ E/τ0（ τE and τ0 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.The new electrorheologicai （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 （7） of 150 s^-1 The relative shear stress, τ E/τ0（ τE and τ0 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.

关 键 词：electrorheological property Y4O（OH）9（NO3）-（NH4NO3） material dielectric and conductive property rare earths 

分 类 号：O611.3[理学—无机化学]