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Impedance spectroscopy is used to evaluate the contributions of grain and grain boundary resistance to conduction process and magnetoresistance (MR) in CrO 2 -TiO 2 granular composites. It is found that there is a transition from two semicircles to a single semicircle in the Nyquist plot with increasing CrO 2 concentration. The resistivities of grain and grain boundary reveal...
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