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Frequency relationship of the electrical resistance of cermet films based on the hexaborides of rare-earth elements

  • Methods of Investigation and Properties of Powder Materials
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Soviet Powder Metallurgy and Metal Ceramics Aims and scope

Conclusions

In this work an investigation was made of the conductivity of cermet films with an alternating current in the 100 kHz-300 MHz range. It was shown that to a significant degree the conductivity of the films depends upon the configuration of the specimens measured and also upon the structure and composition of the films. The relationship of conductivity to specimen configuration may be explained by the influence of the distributed capacitances between the electrodes and the near-electrode areas of the resistive layer.

A new interpretation of the experimental data explaining the relationship of the conductivity of high-resistance specimens to the structure of the films is proposed. In highresistance films “breaks” in the conducting chains are shunted at high frequencies by intergranular capacitances, which leads to an increase in conductivity. The theoretical frequency relationship of conductivity calculated with the use of the theory of percolation agrees well with the experimental data.

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Literature cited

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Authors and Affiliations

  1. Institute of Problems of Material Science, Academy of Sciences of the Ukrainian SSR, Ukraine

    R. K. Islamgaliev, A. V. Zyrin, O. I. Shulishova & I. A. Shcherbak

Authors
  1. R. K. Islamgaliev
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  2. A. V. Zyrin
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  3. O. I. Shulishova
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  4. I. A. Shcherbak
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Additional information

Translated from Poroshkovaya Metallurgiya, No. 8(296), pp. 73–76, August, 1987.

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Islamgaliev, R.K., Zyrin, A.V., Shulishova, O.I. et al. Frequency relationship of the electrical resistance of cermet films based on the hexaborides of rare-earth elements. Powder Metall Met Ceram 26, 664–667 (1987). https://doi.org/10.1007/BF00810630

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  • DOI: https://doi.org/10.1007/BF00810630

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