Extended Effective-Mean-Field Analysis for Electrical Conductivity of Lotus-Type Porous Nickel
We studied the effective electrical conductivity of lotus-type porous nickel with cylindrical elongated pores by applying the extended effective-mean-field (extended EMF) theory that is based on Hatta-Taya’s theory and Bruggeman’s effective-medium approximation. We modeled lotus-type porous nickel as the composite materials with ellipsoidal void inclusion, and examined the effect of shape and orientation of the pores and applied-electric-field direction on the effective electrical conductivity. The extended EMF theory revealed that well-known Archie’s power law is quite useful for expressing the porosity dependence of the electrical conductivity of lotus-type porous metals even though the deviation of porous morphology exists.
Yukichi Umakoshi and Shinji Fujimoto
M. Tane et al., "Extended Effective-Mean-Field Analysis for Electrical Conductivity of Lotus-Type Porous Nickel", Materials Science Forum, Vol. 512, pp. 331-336, 2006