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26Investigation of nanocrystalline CoFe 2 O 4 by positron annihilation lifetime spectroscopyPhilosophical Magazine 83 (6): 765-773. 2003.Nanoparticles of cobalt ferrite prepared by the co-precipitation method with crystallite size varying from 4.7 to 41 nm have been characterized by positron annihilation lifetime spectroscopy. Three lifetime components are fitted to the lifetime data. The shortest lifetime component is attributed to the delocalized positron lifetime shortened by defect trapping. The intermediate lifetime is assigned to the positron annihilation in diffuse vacancy clusters or microvoids at the grain boundaries and…Read more
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28Nonlinear data analysis of experimental (EEG) data and comparison with theoretical (ANN) dataComplexity 7 (3): 30-40. 2002.
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