Georgobiani A.N.,Russian Academy of Sciences |
Levonovich B.N.,State Research and Design Institute for the Rare Metals Industry |
Avetisov I.K.,Mendeleev University of Chemical Technology
Inorganic Materials | Year: 2010
We have studied the effect of annealing on the spectral and photoelectric properties of polycrys- talline CdSe films produced by thermal evaporation and implanted with Se ions to doses from 5 × 10 15 to 5 × 10 16 cm -2. The results demonstrate that, when cadmium vacancies and selenium interstitials are major defects, annealing leads to the formation of microcrystalline two-phase layers during recrystallization, which have low p-type conductivity due to a shallow acceptor at E v + 0.04-0.05 eV, related to interstitial selenium. © Pleiades Publishing, Ltd., 2010.
Soderzhinova M.M.,State Research and Design Institute for the Rare Metals Industry |
Tarasova D.V.,State Research and Design Institute for the Rare Metals Industry |
Chibirova F.K.,State Research and Design Institute for the Rare Metals Industry
Inorganic Materials | Year: 2016
We have studied the effect of aging conditions on the properties of titania hydrosols produced via ultrasonic processing and containing aggregates of 5-nm-diameter amorphous particles. The results demonstrate that, at room-temperature, 0.44 M to 0.11 M hydrosols are stable for 3 to 22 days. During aging for 40 to 45 days, the properties of 0.01 M to 0.0025 M hydrosols remain unchanged. Aging for a longer time causes the amorphous particles to crystallize in the anatase structure. Raising the temperature to 75°C reduces the induction time to 3–4 h. © 2016, Pleiades Publishing, Ltd.
Titov A.A.,Mendeleev University of Chemical Technology |
Eremenko Z.V.,State Research and Design Institute for the Rare Metals Industry |
Goryacheva E.G.,State Research and Design Institute for the Rare Metals Industry |
Sokolova N.P.,State Research and Design Institute for the Rare Metals Industry |
And 3 more authors.
Inorganic Materials | Year: 2013
Crystalline LiNi1/3Co1/3Mn1/3O2 powders have been synthesized by two different procedures, using carbonate coprecipitation from sulfate and nitrate solutions, followed by two-step heat treatment of a mixture of the resultant Ni1/3Co1/3Mn 1/3CO3 precursor and Li2CO3 at 500 and 900 C. The powders have been characterized by X-ray diffraction, scanning electron microscopy, and dynamic light scattering. The results demonstrate that the synthesized compounds have a hexagonally ordered, layered structure of the α-NaFeO2 type. The primary-particle (crystallite) size in the powders is 50 nm and the aggregate size is 150-250 nm. The average size of larger structures (agglomerates) is 11 and 18 μm in the powders prepared via the sulfate and nitrate routes, respectively. The chemical stability of the synthesized powders is shown to depend on the ambient medium. Prolonged storage in air leads to the formation of new, lithium-deficient phases, especially in the case of the powders prepared from nitrate solutions. © 2013 Pleiades Publishing, Ltd.