The dielectric constant and electrical conductivity of a composite of two insulators, poly(1,1-difluoroethylene) (yellow) and K(2)CO(3) (white), increased dramatically near the percolation threshold f(c) (f=concentration of K(2)CO(3)). This intriguing phenomenon can be interpreted in terms of interface percolation caused by the formation of chemically activated interfaces.

Hart an der Grenze: Die Dielektrizitätskonstante und elektrische Leitfähigkeit eines Komposits aus zwei Isolatoren – Poly(1,1‐difluorethylen) (gelb im Bild) und K2CO3 (weiß) – erhöhen sich drastisch in der Nähe der Perkolationsschwelle fc (f=K2CO3‐Konzentration). Dieses Phänomen lässt sich durch Grenzflächenperkolation interpretieren, die durch die Bildung chemisch aktivierter Grenzflächen verursacht wird.

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The synergistic effect associated with displacement damage, hydrogen and heliumin the China Low Activation Martensitic (CLAM) steel has been investigated using the triple ion beamirradiation. Triple ion beams, an iron beam of 109 MeV degraded by a tantalum foil of 7.45 μm thick, the100 keV hydrogen and 200 keV helium, were injected into the CLAM steel samples simultaneously or sequentially.The radiation damage examinations were carried out by the slow positron Doppler broadening technique. Themeasured S parameters indicate that the radiation damage is different for different irradiationprocedures with same dpa and concentrations of H and He. The sample suffers most severe damage in the simultaneoustriple beam irradiation. The present experimental results support the molecular dynamics simulation result that the H facilitates the He-bubble nucleation and growth.