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Moscow, Russia

Balagurov L.A.,OAO Giredmet bolShoi | Agafonova M.A.,Moscow State University | Petrova E.A.,OAO Giredmet bolShoi | Yakovenko A.G.,Moscow State University
Russian Microelectronics

Nanoporous and nanotubular titanium layers have been obtained via electrolytic etching in a mixed organic-inorganic electrolyte. The formation of layers has been studied in situ by electrochemical impedance spectroscopy. It has been shown that the impedance of an electrochemical cell is governed by the impedance of the contact between the electrolyte and titanium at the bottom of nanoporous and nanotubular layers almost throughout the entire process except the initial period. It has been revealed that the electrical resistance of the space charge region in a titanium layer is higher than the charge transfer resistance at the electrolyte/TiO x interface. This indicates that the rate of the growth of porous and nanotubular layers obtained via etching in an organic-inorganic electrolyte is limited by the transfer of titanium and oxygen ions through an oxide layer instead of the diffusion of ions in the electrolyte. © 2013 Pleiades Publishing, Ltd. Source

Drabkin I.A.,OAO Giredmet bolShoi | Karataev V.V.,OAO Giredmet bolShoi | Osvenskii V.B.,OAO Giredmet bolShoi | Parkhomenko Y.N.,OAO Giredmet bolShoi | And 5 more authors.
Russian Microelectronics

The dependence of the thermoelectric properties of the nanostructured bulk (Bi,Sb)2Te3 material on the composition and the spark plasma-sintering (SPS) temperature T SPS has been studied. It has been revealed that the Bi0.4Sb1.6Te3 solid solution sintered at a temperature of 450-500 C has a thermoelectric figure of merit ZT = 1.25-1.28. The dependence of thermoelectric properties on the sintering temperature T SPS above 400 C is correlated to the transformation of the fine structure of the material due to the rearrangement of point vacancy-donor defects in the process of repeated recrystallization. It has been established that point structural defects make a considerable contribution to the formation of the thermoelectric properties of nanostructured material. © 2013 Pleiades Publishing, Ltd. Source

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