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PHASE TRANSITION OF HEXAGONAL BE NANOCRYSTAL INTO CUBIC SUPERLATTICE UNDER X-RAY RADIATION
Abstract
The structure and phase composition of annealed and irradiated beryllium plates were studied by X-ray analysis. Durable X-ray irradiation leads to phase transition of a normal hexagonal beryllium lattice into a beryllium superlattice. This superlattice is composed of beryllium superatoms that form a face-centered cubic lattice with the lattice parameter of 6.2205 ? and a superatom core that crystalizes into a diamond-type lattice with the lattice parameter of 1.5703?. It is shown that beryllium has three phase states: normal (hexagonal lattice), a superlattice which composed of nanocrystals beryllium and form F-structure, a nanocrystallites core which is composed of 56 atoms (the magic number) crystallizes in a diamond-type lattice.It was found that by doping with beryllium various alloys after heat treatment, it is relatively easy to form covalent bonds between the atoms of ?Be? and alloys. This results in increased strength, hardness, elasticity, and corrosion resistance of the resulting materials (alloys). Good reflectivity of neutrons can be explained by a very high density and magnetic moment of superatom.
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