Complex permittivity of graphite, carbon black and coal powders in the ranges of X-band frequencies (8.2 to 12.4 ghz) and between 1 and 10 ghz

Masahiro Hotta, Miyuki Hayashi, Michael Thomas Lanagan, Dinesh Kumar Agrawal, Kazuhiro Nagata

Research output: Contribution to journalArticlepeer-review

82 Scopus citations

Abstract

The real and imaginary parts of the relative complex permittivity (εr' and εr") were measured in the ranges of X-band frequencies (8.2 to 12.4 GHz) and between 1 and 10 GHz for graphite, carbon black and coal powders at room temperature so as to clarify the relation between the complex permittivities of carbonaceous materials and their characteristics, i.e., graphitization, porosity (i.e., specific surface area) and ash contained in coals. It is found that the complex permittivities increase with increasing crystallite size and specific surface area. It is also found that the dependency of the permittivities on the ash content seems be negligible within the range of the ash content in the present study.

Original languageEnglish (US)
Pages (from-to)1766-1772
Number of pages7
JournalISIJ International
Volume51
Issue number11
DOIs
StatePublished - 2011

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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