Percolative Conduction in a Composite System of Metal and Ceramics

All-ceramic lead-free percolative composite with a colossal dielectric response

“…[8][9][10][11][12][13][14][15][16][17] Here, ε m is the real part of the complex dielectric constant of an insulator matrix, p is the volume concentration of the conductive admixture, p c is the percolation threshold for the conduction (unambiguously defined in the ideal composite with the zeroconductivity of the matrix via σ dc = 0 for p < p c ), and q is the critical exponent. Several values for the percolation-critical exponents and the threshold value have been proposed on the basis of theoretical derivations 1-4 or numerical calculations.…”

“…Very high dielectric constants can thus be achieved in metal-insulator composites close to the percolation point, however, up to now mainly organic percolative composites [8][9][10][11] and inorganic composites comprising metal particles dispersed in a dielectric matrix [12][13][14][15][16][17] have been developed. In organic percolative composites values of the dielectric constant as high as 7000 were obtained.…”

Percolation Process in Anisotropic Cluster-Structure of a Two-Phase Composite

“…However, the relevant information obtained for actual multiphase media seems to be far less than that of the above numerical simulations [4]. In particular, little has been investigated for the behavior of the anisotropic percolation-clusters in actual media.…”

“…Recently, the percolation phenomena, which describe a critical behavior of the growing clusters of a constituent phase, have attracted considerable interest in the context of the above problem [3][4][5][6]. In the percolation process, as the volume fraction(f) of one of the phases increases, its clusters grow with increasing speed by undergoing repeatedly an incorporating process where adjacent clusters interlink with each other.…”

All-Ceramic Percolative Composites with a Colossal Dielectric Response

“…Very high dielectric constants can thus be achieved in metal-insulator composites close to the percolation point. However, up to now mainly organic percolative composites (Dang et al, 2003;Xu & Wong, 2005) and inorganic composites comprising metal particles dispersed in a dielectric matrix (Deepa et al, 2007;Grannan et al, 1981;Li et al, 2001;Yoshida, 1990) have been developed. In organic percolative composites values of the dielectric constant as high as 7000 were obtained .…”