The CoFe2O4 ferrofluid was studied by positron annihilation technique. Theexperimental results showed that there were three kinds of lif e-time stateτ1= 151.0ps
τ2 = 457.9ps and τ3 = 2325.6ps in the positron annihilation spectrum. Itindicated that there were a large number of vacancy and vacancy cluster in thesurface layer of the CoFe2O4 nanoparticles.
School of Physics and Technology, Hubei Key Laboratory of Nuclear Solid State Physics, Wuhan University
Suzhou Nuclear Power Research Institute
School of Physics and Technology, Hubei Key Laboratory of Nuclear Solid State Physics, Wuhan University
School of Physics and Technology, National Demonstration Center for Experimental Physics Education(Wuhan University), Hubei Nuclear Solid Physics Key Laboratory, Wuhan University