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	A new class of electrorheological material, preparation and electrorheological property of K2O-doped Y2O3 material
	Ni, N ; Shang, YL ; Li, JR ; Wang, J ; Zhang, YJ ; Zhang, SH
	2006
关键词	electrorheological property Yttrium oxide potassium oxide microstructure EARTH-DOPED TIO2 FLUIDS SUSPENSIONS
英文摘要	A new class of electrorheological (ER) material using rare earth yttrium oxide as the substrate, K2O-doped Y2O3 materials, have been synthesized using K2CO3 and Y(NO3)(3) as starting materials. Their ER performance, dielectric property and microstructure have been studied. The results show that the K2O doping can markedly enhance the ER activity of the Y2O3 material. A clear dependence of the ER effect on the degree of KO doping has been observed. The shear stress of the suspension (25 wt%) of a K2O-Y2O3 material (K/Y = 0.4, molar ratio) in dimethyl silicone oil reaches 1.6 kPa at electric field strength E=4.2 kV/mm and shear stress rate gamma = 300 s(-1), and its relative shear stress tau(r), which is defined as the ratio of shear stress at E=4.2 kV/mm to zero-field shear stress (tau(r) = tau(E)/tau(0)), reaches 6.6, which is six times higher than that of pure Y2O3. Investigations on relationships between ER effect and the microstructure and dielectric property of the materials indicate that the microstructure plays an important role, and dielectric property is a dominant factor in the modification of the ER effect of the particle materials. The results obtained in the research for these new ER materials is helpful for understanding further the mechanism of the ER effect and improving the ER material. (c) 2005 Elsevier B.V. All rights reserved.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000238781500011&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; SCI(E); EI; CPCI-S(ISTP); 2
语种	英语
DOI标识	10.1016/j.jallcom.2005.08.104
内容类型	其他
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/251805]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Ni, N,Shang, YL,Li, JR,et al. A new class of electrorheological material, preparation and electrorheological property of K2O-doped Y2O3 material. 2006-01-01.

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