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

作者：Hotta Masahiro^*; Hayashi Miyuki; Lanagan Michael Thomas; Agrawal Dinesh Kumar; Nagata Kazuhiro

来源：ISIJ International, 2011, 51(11): 1766-1772.

DOI：10.2355/isijinternational.51.1766

• permittivity
• carbonaceous materials
• specific surface area
• graphitization
• purity
• microwave frequency

The real and imaginary parts of the relative complex permittivity (epsilon(r)' and E-r '') 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.

• 出版日期2011