Figure 6

Fitting curves of the imaginary part of the dielectric constant as a function of temperature. (a) The fitting curve of CJ coal sample at three frequencies, (b) The fitting curve of WS, CZ, and TS coal samples at 10 kHz, (c) The fitting curve of WS, CZ, and TS coal samples at 100 kHz, (d) The fitting curve of WS, CZ, and TS coal samples at 1000 kHz.