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Soviet Physics Journal

, Volume 11, Issue 1, pp 94–96 | Cite as

Dielectric loss of coal as a function of temperature and frequency

  • M. P. Tonkonogov
  • V. A. Veksler
Brief Communications
  • 23 Downloads

Conclusions

  1. 1.

    Adsorbed water has various effects on tan δ for coals. If tan δ ≈ ≈ 0.5, ɛ and tan δ increase with the water content. If tan δ ≈ 50, ɛ increases but tan δ decreases.

     
  2. 2.

    The dielectric loss along the bedding in a dried coal exceeds that across the bedding by a factor 10–100. The loss across the bedding is mainly of relaxation type, while conduction dominates tan δ along the bedding (especially at low frequencies).

     
  3. 3.

    The ɛ along the bedding for a dried coal is much greater than that across the bedding and is very much dependent on frequency. This difference almost vanishes at high frequencies. Ion displacement contributes to ɛ along the bedding at low frequencies.

     
  4. 4.

    The temperature dependence of tan δ indicates that coal has a very open structure along the bedding and that conduction dominates the loss in that direction.

     

Keywords

Bedding Dielectric Loss Adsorbed Water Open Structure Relaxation Type 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    A. A. Agroskin, The Physics of Coal [in Russian], Moscow, 1966.Google Scholar
  2. 2.
    K. Higasi, I. Miyasita, and Y. Ozzawa. Bull. Chem. Soc. Japan,30, no. 5, 546, 1957.Google Scholar

Copyright information

© Consultants Bureau 1972

Authors and Affiliations

  • M. P. Tonkonogov
    • 1
  • V. A. Veksler
    • 1
  1. 1.Karagande Polytechnic InstituteUSSR

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