Figure 5

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