Study of electrical properties of piezoresistive pastes and determination of the electrical transport

The study reveals that the conductivity is shown to vanish as x approaches a critical concentration xc by following a power law with non-universal critical exponents, while the piezoresistivity diverges at the same critical concentration. We argue that non-universality and diverging piezoresistivity have the same origin and arise from the highly fluctuation inter-grain tunneling distances determined by the segregated microstructure of TFRs.