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  • P.

    27. E.I.Zhmurikov, P.V.Logachev (Budker Institute of Nuclear physics SB RAS, Novosi- birsk, Russia); A.I.Romanenko, O.B.Anikeeva, Yu.V.Lavskaya, L.G.Bulusheva,

    • A.

      B.Okotrub (Nikolaev Institute of Inorganic chemistry SB RAS, Novosibirsk, Russia);

    • S.

      V.Tsybulya, O.G.Abrosimov (Boreskov Institute of Catalysis SB RAS, Novosibirsk,

Russia) THE

INVESTIGATION

OF

ELECTRONIC

STRUCTURE

OF

PRISTINE CARBON COMPOUNDS FOR PRODUCTION OF NEW

MATERIALS CONVERTER

BASED

ON

13C

ISOTOPE

FOR

NEUTRON

The creation of intensive source of high-energy neutrons based on proton accelerator is the important task of high-energy physics. The neutron producting target is a principal part of the neutron source. Materials for making the neutron target must be with high strength to high temperature. While working neutron target has took from a beam and has r e m o v e 1 5 0 - 2 0 0 k W a t a s p o t 1 s m 2 s i z e d u r i n g c o n t i n u o u s p r o c e s s . T h e c a r b o n n a n o m a - 13 C isotope are the most perspective material for strict to investigate the electronic properties of starting sub- using the X-ray fluorescence spectroscopy, quantum terial containing large quantity of conditions. The aim of this work is stance composed of 13C isotope,

chemistry calculation cence spectra we can

and conductivity measurements. From analysis of X-ray fluores- attain the information about material valence band structure and

about electronic ing. The density

interaction between of C2π-state for the

carbon atoms during a formation of chemical bind- spectrum of substance composed of 13C is increased

in comparison with the spectrum of starting substance composed of 13C and 40A thickness in equal parts.

graphite. The analysis of the X-ray diffraction of the shows to the presence of graphite particles with 20A Temperature dependence of a relative conductivity

(T)/ (300K) for 13C samples with higher density was measured. This dependence can be submitted as power one, where the power is close to 1. Such character of temperature de- pendence for conductivity in principal can be connected with the unelastic resonance tun- neling mechanism in intercrystalline phase, or three-dimensional quantum correction to the conductivity of carbon-carbonic composite. So C150 graphen structure was modeled, and it has a size about 20A. For the proposed structure of the C150 structure quantum- chemical calculations (B3LYP method, 6-31G** basis set) were made. On the base of the result of this calculation the theoretical CK - spectrum of the graphen was obtained. Also the theoretical CK -spectra of the graphite was obtained taking into account carbon atoms of central hexagon of the C150 graphen. The theoretical spectrum of graphite agrees closely with the experimental one.

Eugenij Izotovich Zhmurikov: jmurikov@mail.ru

67

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