Abstract
Dielectrics with metal-like dispersion are realized by percolating networks of submicrometer metal particles embedded in conventional dielectric materials. Their dielectric function ε=-i was determined in the range 5 Hz≤ω/2π≤ Hz. A metal-like loss dispersion (∝) was measured over frequency intervals of up to eight orders of magnitude. The corresponding conductivities are many orders of magnitude lower than the bulk-metal values, however, they are still much higher than for known lossy dielectrics. Systems with a partial particle agglomeration, but no dc conductivity (no percolation), already show enhanced (ω) values, but no power law for the frequency dependence. This is in contrast with isolated particles, where (ω)=const holds.
- Received 14 October 1991
DOI:https://doi.org/10.1103/PhysRevB.45.8929
©1992 American Physical Society