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The SiO2 adsorbing YF3, Y2 (CO3) 3, Y2 (C2O4) 3 and YPO4, respectively, formed four systems of particle materials: SiO2·YF3, SiO2·Y2 (CO3)3, SiO2· Y2 (C2O4) 3 and SiO2· YPO4. The electrorheological (ER) behavior of the electrorheologic