Granular metal

A -4 and AS-8- Russian granular metallized expls claimed to be more effective than AN-based industrial expls Detonit lOAand Am-monit No 1. Their compn is not given in CA listed below... 

When granular metallic iron smaller than 0.5 mm was used, an optimum reaction rate was obtained. The ratio of metallic iron to hypochlorite concentration was approximately 1.1-fold in terms of the stoichiometric ratio. The contact time of granular metallic iron with chlorinated water was approximately 25 min thus, at pH less than 7, the chlorine residues were totally removed within 25 min from the beginning of the reaction. 

Although experimentally the low temperature regime is well within the experimental reach [1, 2], it has never been addressed theoretically so far. The important question whether the system is a metal or becomes an insulator, in other words, whether the conductivity of the granular metals at large conductances remain finite in the limit of T —> 0 is still open. 

The next step is to consider the diffusion motion of electron through a granular metal Diffusion motion inside a single grain is given by the usual ladder diagram that results in the diffusion propagator... 

To obtain the total correction to the conductivity of granular metal the two other diagrams, (d) and (e) in Fig. 3 should be taken into account. These diagrams result in the following contribution to the conductivity... 

Quantum-Size Effects in Granular Metals Near the Percolation... 

Chapter 11 provides a state-of-the-art description of the physical properties of granular metals or nanocomposites (metallic grains embedded in... 

The influence of the various types of quantum effects and, in particular, of the quantum-size effect on the electronic transport in granular metals is described in the vicinity of the percolation transition. 

Another reason for the size-dependent properties in granular metals is not manifestation of quantum effects, but the rise of the surface state fraction. If one considers a metal granule as a sphere with diameter D and thickness of the surface layer hs, it is clear that the interface portion depends on the granule size and its relative contents are described by the following equation ... 

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