Elchin Huseynov, Adil Garibov and Ravan Mehdiyeva
Institute of Radiation Problems of Azerbaijan National Academy of Sciences, Azerbaijan
Posters-Accepted Abstracts: J Material Sci Eng
As a research object it has been taken SiO2 with 160 m2/gr specific surface area, 20 nm particle size and 99.5% purity. Nano SiO2 has been irradiated at full power mode (250 kW) by neutron flux with 2x1013 n/cm2s flux density in central channel (channel A1) at TRIGA Mark II light water pool type research reactor in â??Reactor Centreâ? of Jozef Stefan Institute in the Slovenia. It is important to note that the JSI TRIGA reactor has been thoroughly characterized and the computational model used for computational characterization has been thoroughly verified and validated against several experiments. While working at full power mode, the neutron flux has the following composition parts: 5.107x1012 n/cm2s (1?±0.0008, En< 625eV) for thermal neutrons, for epithermal neutrons â?? as 6.502x1012 n/cm2s (1?±0.0008, En ~ 625eV ?· 0.1MeV), for fast neutrons - 7.585x1012 n/cm2s (1?±0.0007, En> 0.1 MeV) and finally for all the neutrons in central channel flux density is as 1.920x1013 n/cm2sec (1?±0.0005). Electric parameters of initial and neutron-irradiated nano SiO2 have been measured in â??Novocontrol Alpha High Resolution Dielectric Analyzerâ? device at 0,09Hz â?? 2,3MHz range of frequency and 100K â?? 400K temperature range in the laboratory of â??Condensed Matter Physics F5â? of JSI. In the result of the conducted researches it has been revealed that under neutron flux influence extra â??chargesâ? are generated inside nano SiO2 samples. The generated â??chargesâ? lead to an increase in polarization in the sample. So it increases the numerical value of real and imaginary parts of dielectric constant in proportion to irradiation. In general tendency specific charges and the ones generated with the influence of neutron flux are polarized more actively under temperature influence. As a result, real and imaginary parts of dielectric constant increase with temperature increase within about 100-300 K range. At about 300-400 K temperature range some â??chargesâ? generated under the influence of neutron flux are lost due to temperature effect and polarization reduces. The effects occurred under temperature influence are observed more obviously at low frequencies. Destruction of the charges with different barrier energy existing in the system due to frequency influence, lead to a decrease in numerical value of real and imaginary parts of dielectric constant.
Journal of Material Sciences & Engineering received 3677 citations as per Google Scholar report
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