A New Nanoporous Material Based on Amorphous Silicon Dioxide

Processes for making nanoporous SiO2 layers on Si via the irradiation of thermally oxidized silicon wafers with fast ions followed by chemical treatment in a solution or vapor of hydrofluoric acid are presented. It is shown that the density, shape, diameter, and length to diameter ratio of channels etched in silicon dioxide can be controlled by varying the regimes of fast ion irradiation or chemical treatment of SiO2/Si structures. Track parameters calculated using the thermal spike model are compared with the chemical etching data

Depth concentrations of deuterium ions implanted into some pure metals and alloys

Pure metals (Cu, Ti, Zr, V, Pd) and diluted Pd-alloys (Pd-Ag, Pd-Pt, Pd-Ru, Pd-Rh) were implanted by 25 keV deuterium ions at fluences in the range (1.2{\div}2.3)x1022 D+/m2. The post-treatment depth distributions of deuterium ions were measured 10 days and three months after the implantation using Elastic Recoil Detection Analysis (ERDA) and Rutherford Backscattering (RBS). Comparison of the obtained results allowed to make conclusions about relative stability of deuterium and hydrogen gases in pure metals and diluted Pd alloys. Very high diffusion rates of implanted deuterium ions from V and Pd pure metals and Pd alloys were observed. Small-angle X-ray scattering revealed formation of nanosized defects in implanted corundum and titanium.Comment: 12 pages, 9 figure

Плазмохимический синтез оксидных композиций из водно-органических нитратных растворов неодима и иттрия

Исследован плазмохимический синтез оксидных композиций из водно-органических нитратных растворов неодима и иттрия. Установлены закономерности влияния органического компонента на показатели горючести водно-органических нитратных растворов неодима и иттрия. Установлены закономерности влияния массовой доли матрицы на площадь удельной поверхности и размер оксидных композиций.The plasma-chemical synthesis of oxide compositions from aqueous-organic nitrate solutions of neodymium and yttrium has been studied. The regularities of the influence of the organic component on the flammability indicators of aqueous-organic nitrate solutions of neodymium and yttrium have been established. The regularities of the influence of the mass fraction of the matrix on the specific surface area and the size of oxide compositions have been established

Evolution of Structural Damage in Aluminium Irradiated with Xenon Ions

Structural defect evolution in highpurity aluminium both asirradiated and annealed after irradiation has been investigated by transmission electron microscopy. The foils of highpurity aluminium were irradiated with 124 MeV Xe ions with fluence up to 2\cdot 10^{16} Xe^+ cm^{2} at room temperature and at 100 ^{o}C. The samples irradiated at 100 ^{o}C were annealed at 480 and 600 ^{o}C. At initial stage of irradiation, at low fluence (\leq 2\cdot 10^{14} Xe^+ cm^{2}) the isolated dislocation loops are observed. When ion fluence increased the loops grow. At fluences above 10^{15} Xe^+ cm^{2} cm the microstructure is characterized by highdensity small voids (pores) which are grown and slowly merged with fluence increasing. For these conditions, the most possible mechanism of pore growth is their diffusioncontrolled coalescence