K. K. Kadyrzhanov

Influence of electrodeposition parameters on structural and morphological features of Ni nanotubes

Nickel nanotubes have been formed in pores of ion-track membranes using electrochemical deposition. Morphologic and structural features of these nanostructures have been comprehensively studied. The evolution of the nanotubes wall thickness and parameters of their crystalline structure by variations of the synthesis voltage and temperature has been determined. On the base of these data the nanotubes growth mechanism has been estimated.

Tunable synthesis of copper nanotubes

Simple method of tunable synthesis of copper nanotubes based on template synthesis was developed. A comprehensive study of the structural, morphological and electrical characteristics of the obtained nanostructures was carried out. Characterization of structural features was made by methods of scanning electron microscopy, energy dispersive spectroscopy and X-ray diffractometry analysis. Evaluation of wall thickness is made by methods of gas permeability. Electrical conductivity of nanotubes was define in the study of their current-voltage characteristics. The possibility to control of copper nanotubes physical properties by variation of the deposition parameters was shown.

Thermal stabilization of phase and structural state in binary lamellar metallic systems.

The paper proposes and describes a physical model of thermally induced processes in binary lamellar systems. The model has been developed for the theoretical explanation of an experimentally revealed fact of thermal stabilization of intermetallic phases on the surface of a lamellar sample. Based on the model we developed an algorithm for calculations and a computer code that operates with three one-phase and two two-phase regions in the binary alloy state diagram. The computational model includes as inputs changes in concentration boundaries for existing phases with change in temperature, as well as arbitrary temperature-time regimes for the thermal treatment of the lamellar system under investigation. Good agreement between the theoretical calculations and Mössbauer investigations of binary lamellar Fe-Be systems has been achieved.

Electrochemically deposited copper nanotubes

Copper nanotubes are electrochemically synthesized using ion-track polyethylene terephthalate templates. The structure and morphology of the nanotubes constructed under different synthesis conditions are studied with the assistance of scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction analysis, and the manometric gas-permeability method. The dependence of structural features on the electrodeposition potential is established.

Structure and physical properties of iron nanotubes obtained by template synthesis

Iron nanotubes with an aspect ratio of approximately 100 are synthesized by electrochemical deposition using polyethylene terephthalate templates. The structural and morphological features of the nanotubes are studied in detail by scanning electron microscopy, energy dispersive analysis, transmission electron microscopy, electron diffraction, X-ray diffraction analysis, and gas permeability. The main magnetic parameters and their dependence on temperature are determined by vibration magnetometry and Mössbauer spectroscopy.

Mössbauer studies of the thermal stability of layered metallic systems

Methods of Mössbauer spectroscopy at 57Fe nuclei and X-ray diffraction analysis have been used to investigate layered systems Fe (5 μm)-Zr (2 μm) and Fe0.966Ti0.034(13 μm)-Ti (1 μ)-57Fe(0.8 μm) obtained by the method of ion-plasma deposition and subjected to sequential isothermal annealings at T = 900 and 650°C, respectively. The relative content of phases that are formed in the systems at each stage of annealing has been established and the sequence of transformations and their kinetics have been determined. For both systems, thermal stabilization of the structural and phase state, which is inhomogeneous in depth, has been observed.

Mössbauer Study of Thin Iron Film Beryllization

Beryllium coating of the iron foil is made by means of magnetron sputtering. Mössbauer studies are performed by means of two registration techniques: conversion electron Mössbauer spectroscopy (CEMS) and the γ-ray technique in absorption geometry. Performed investigations confirm the original thermodynamic approach to creation of thermally stable multi-layer materials.

Diffusion and phase formation in thin two-layer Fe–Be films after subsequent isochronous annealing

Abstract The two-layer Fe–Be system, obtained by magnetron sputtering of Be onto α-Fe foils, is studied by Mossbauer spectroscopy. A succession of phase transformations at increasing temperatures in an isochronous annealing series is determined. For the description of the phase formation processes, a physical model is proposed, which takes into account the mutual diffusion as well as specific features of the Fe–Be phase diagram. A computer code is developed on the basis of the proposed model that allows a quantitative description of the phase formation/disintegration kinetics in any depth region of the laminar binary Fe–Be system and arbitrary annealing regimes.

Phase transformation studies in implantation induced iron–metalloid systems studied by Mössbauer spectroscopy

Abstract In this work, the implantation systems Fe:B+, Fe:C+ and Fe:O+ are studied by the Mossbauer spectroscopy methods. General regularities and peculiarities inherent to formation and disintegration of the stable and metastable phases in the implanted iron–metalloid systems subject to irradiation and subsequent isochronous thermal annealing are established. The tendency of phase transformation in the implanted layer as the annealing temperature and implanted ion concentration are varied, is predicted by phase diagram. The observed process of phase transformation deceleration at high temperature is connected with formation of the two-phase precipitates as steady elements.

Effect of thermal annealing on the structural and conducting properties of zinc nanotubes synthesized in the matrix of track-etched membranes

Results of studies of the effect of thermal annealing on the structural and conducting properties of ordered arrays of zinc nanotubes prepared by electrochemical deposition in track-etched membranes based on polyethylene terephthalate (PET) have been described. The dimensions, chemical composition, and crystal structure of the synthesized samples have been integrally analyzed using scanning electron microscopy, X-ray diffraction, and energy dispersive analysis. It has been shown that the thermal annealing of zinc-based nanotubes makes it possible to control the formation of an oxide phase in the nanostructures. The presence of the ZnO oxide phase in an amount of no more than 10 wt % leads to a decrease in the resistivity and an increase in the conductivity. In addition, by changing the crystal structure of Zn nanotubes by thermal annealing, it is possible to prepare ordered arrays of n-type semiconductors with considerable prospects of widespread use in nanoelectronics and nanooptics.