Chromium disilicide

Chromium Disilicide, CrSij, has been prepared by the method described for the previous compound, a higher percentage of silicon being used. It has also been obtained by heating a mixture of chromium sesquioxide and charcoal with excess of silica in an electric furnace. By the first method the silieide is obtained as a grey crystalline powder by the second, as long, grey, lustrous needles, only obtained free from silicon with difficulty. Density 4-393. It is decomposed by hydrofluoric acid. 

It was shown that chromium disilicide (CrSi2, Eg= 0.35 eV) nanociystallites are embedded in monocrystalline lattice by reactive deposition epitaxy (RDE of Cr) and Si molecular beam epitaxy (MBE) [1]. Redistribution of CrSi2 NCs has been observed in silicon-silicide-silicon heterostructures with one embedded layer by HR XTEM data [2]. 

The estimation of the energy gap of the CrSi2 film within the EMT was performed using the computed effective masses of the charge carriers for the bulk chromium disilicide [8] (in units of the free electron mass mf for electrons - = 0.69mo ... 

Optimization of growth parameters has permitted to create multilayer monolithic heterostructures (MMH) with buried nanocrystallites of iron and chromium disilicides. A new approach to study of optical properties of MMH-structures has been developed and tested. 

K spectra of silicon were obtained in pure silicon, CtSi, and CrSij. The identity of Kg of silicon in pure silicon, CrSi, and CrSij can be assumed from a comparison of Kg of pure silicon and chromium silicides. The semiconducting properties of chromium disilicide may be due to the presence of a partially covalent bond. A comparison of the structures of CrSi and CrSi2 indicates the identity of silicon atoms in the first coordination sphere. 

Chromium disilicide has a hexagonal cell made up of close-packed hexagonal layers each Si atom is surrounded by four silicon and six chromium atoms. By analyzii the nature of the... 

CHARACTERISTIC FEATURES OF THE PHYSICOCHEMICAL STRUCTURE OF CHROMIUM DISILICIDE ... 

It is known that chromium disilicide belongs to space the group 2 2. However, it is rather difficult to verify whether such a structure is formed as a result of simulation. Therefore, the radial pair distribution functions of silicon and chromium atoms were constructed to evaluate the crystallographic structure of the resulting chromium disilicide. Figure 5.10 presents the plots of the radial pair distribution functions for the CrSi2 unit cell and for the system obtained as a result of simulation. 

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