A study on natural coral stone—a fractal solid

This present research work contains the study of natural fractal material, coral stone. X-ray diffraction, FTIR, optical, DC and AC electrical characteristics are studied. The study includes Arrhenius like plots for both wafer and powder form of the material. Measurements show a possible partially irreversible phase transition occurs when coral is heated for a long time at an about 115 °C. From the XRD data it has been also established that coral stone contains nano sized clusters which is supported by DC electrical measurement. The variation of AC conductivity of coral with thickness of the sample is studied and found exhibit an interesting feature of fractal solid. A scaling relation between AC conductivity and thickness has also been proposed here. The overall behavior of the specimen is like that of a fractal system.