ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Thin layers of silica containing carbon and iron oxides have been prepared by the sol-gel method. The samples were investigated using Auger electron spectroscopy, energy loss, microhardness and Mössbauer effect measurements. It is shown that carbon is located in the pores of the silica network. The electrical conductivity depends on the temperature of heat treatment in the vacuum. The maximum value of conductivity was observed for an annealing temperature about 600 to 800° C. All samples exhibited low activation energy ∼ 0.12 eV. It is suggested that the mechanism of conductivity can be interpreted as a tunnelling process of electrons between carbon granules.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00638060
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