INFLUENCE OF THE X-RAY IRRADIATION ON A CRYSTALS β-TlInS2 POLITIPES CONDUCTIVITY

It was investigated the influence of temperature changes on conductivity of a non-irradiated and X- ray radiated samples of e-TlInS2 crystals polytypies. Object of the study - irradiated and radiated samples of e-TlInS2 crystals polytypes. Purpose of the study - experimental investigation conductivity temperature dependences on the DC (direct current) e-TlInS2 crystals irradiated and X-ray radiated С- and 2С- polytypes. Method of the study - the temperature dependence of electrical conductivity on DC was experimentally investigated in temperature range Т = 100-300 K for the non-irradiated and X-ray radiated C- and 2C-polytypes of e-TlInS2 crystals. It is shown that the basic mechanism of transfer of charge in the temperatures interval T=130-165 K for both e-TlInS2 crystals polytypies is variable range hopping conduction and such temperature intervals are wider in case of the radiated samples. The densities of localized states near the Fermi level were calculated, for both non-irradiated and X-ray radiatied (dose 2.7х103 Gy) samples of e-TlInS2 crystals polytypies. It was discovered that irradiation by the indicated dose of X-ray radiation of the samples both crystals e-TlInS2 polytypies increase of their conductivity, almost on an order, and also is accompanied by disappearance for non-irradiated sample of C-polytype unusual for semiconductors temperatures change of conductivity in the interval T=196-214 K. KEYWORDS: POLYTYPES, X-RAYS RADIATION, CONDUCTIVITY, SEMICONDUCTORS, HOPPING CONDUCTIVITY

Mathematical model of radiation-induced conductivity in quartz under the influence of high-power X-ray radiation

A model of generation and dynamics of radiation conductivity in quartz under the action of powerful soft X-ray radiation is constructed. The charge carrier dynamics model is based on the joint solution of self-consistent kinetic equations and Maxwell's equations. The model was verified by comparing the current calculations on the quartz surface with experiments on the Angara-5-1 thermonuclear installation. The current over the surface of the quartz sensor generated by a powerful pulse of soft X-ray radiation from the Angara-5-1 setup was taken as experimental data.

Microstructural Characterization and Properties of Silica Aerogels Doped with Nano-ITO Powder

Silica-based aerogels doped with nano-ITO powder were synthesized using sol–gel process followed by supercritical drying. The main factors were studied including dosage of compling agent KH570 and ITO. The result shows that thermal radiation conductivity is 0.02659 W/(m•K) with ITO of 44.44% after 10 g ITO powder is modified with 1 mL KH570. The microstructure and physical characteristic of the SiO2–ITO aerogels were characterized by FTIR, SEM, TG-DSC and BET. Their specific surface was in the range of 513–775m2/g and their average pore size was mainly 20 nm. Nano-ITO powders are physically embedded by SiO2aerogels.